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A Skeleton Progression for Teaching of the Standard Algorithm with Some Reference and Support Materials. East Riding of Yorkshire Numeracy Team November 2002 A Skeleton Progression Contents Introduction Addition Grid for Yrs 3 to 6 Extracts from the Framework for easy reference Subtraction Grid for Yrs 3 to 6 Extracts from the Framework for easy reference Subtraction: An alternative approach using negative numbers Multiplication Grid for Yrs 3 to 6 Extracts from the Framework for easy reference Napier’s Boxes (An approach to multiplication) Division Grid for Yrs 3 to 6 Extracts from the Framework for easy reference Year Year Year Year 3 4 5 6 Grid Grid Grid Grid for for for for all all all all four four four four operations operations operations operations “Always Ask” A poster for classroom use. Introduction This booklet provides a skeleton progression for the teaching of the standard algorithm that is recommended in the “Framework for Teaching Mathematics from Reception to Year 6”. These written methods are to be used when mental calculations become too difficult and jottings may be inefficient or prone to mistakes. Definitions: Mental methods: The ability to calculate “in your head”, quickly recalling a growing number of known number facts and using these and an understanding of the number system to deduce others. Jottings: Children’s own recordings that support their mental methods and which, although informal, help memory, keep track of the steps in a calculation and are mathematically sound. Formal written methods: A structured and efficient written recording that supports the pupils’ mathematical thinking and can be understood and recognised by others. The progression described appertains to teaching pupils how to calculate with large or difficult numbers. When pupils are using mathematics to solve problems they should be allowed to choose the most appropriate method for calculation. They should be encouraged to consider whether they can solve the calculation mentally, either with or without jottings. If this is inappropriate they should then be able to move to a formal written method. APPROACHES TO WRITTEN CALCULATIONS: Addition Year 3 Year 4 Rapid recall Number bonds to 20. Within 100, addition of any number to a multiple of 10. UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 100. Ability to partition within 100. Use of the open number line. Framework-Sec 5-Pg 43 A proposed progression with expectations for each year. ( The “average” child ) Develop partitioning of numbers and use empty number lines with increasingly difficult numbers. Work calculations horizontally and vertically side by side working with most significant digit first. Rapid recall Add strings of upto 4 numbers. Within 1000 addition of any number to a multiple of 10 or 100 UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 1000. Decimals in money (£1.36).Partition within 1000. Use of open number line. Framework-Sec 6-Pg 48 NOT NECESSARY to use compensation as a written method. Begin expanded method, adding most significant digit first. See A. Progress to handling least significant first. See C. [This will prepare for carrying below the line ~ compact method.] Year 5 Year 6 Rapid recall Add strings of upto 5 numbers. Rapid recall Add strings of numbers UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 10 000 and decimals in money and measures. Use of open number line with decimals. Framework-Sec 6-Pg 49 NOT NECESSARY to use compensation as a written method. UNDERSTANDING OF THE NUMBER SYSTEM. Place value to any number of digits and 2 dp. Use of open number line with upto 2 dp. Use Carrying method. See C. For those not confident from Y 4 continue with A but teach C when appropriate. [If appropriate use expanded method A but handling least significant digit first for decimals.] Framework Sec 6-Pg 49 NOT NECESSARY to use compensation as a written method. As Yr 5 extending method to any number of digits and decimal places. [Children not confident with carrying use expanded method.Teach C again when and if appropriate.] AIM All children add two 2-digit numbers; some add two 3-digit numbers. AIM Most children use compact method when appropriate, ie two 3-digit numbers or several numbers. (NOT two 2-digit numbers) AIM Most children able to use carrying by end of year; numbers upto 10 000 and decimals] AIM Children use carrying method when appropriate. Decimals, including money Two or more 3-digit sums of money eg £4.21 + £3.87 Adding two or more 3-digit numbers with 1 or 2 decimal places. Adding 2 or more numbers with upto 4 digits and / or 1 or 2 dp. TIME :- Teach addition of time by counting on, use open number lines. APPROACHES TO WRITTEN CALCULATIONS: year. Subtraction Year 3 Rapid recall Number bonds to 20. Within 1000, subtract any multiple of 100. UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 100. Ability to partition within 100. Use of the open number line. Framework-Sec5-Pg 45 NOT NECESSARY to use compensation as a written method. Develop counting on / back with empty number lines and shortened vertical method side by side, using 2 & 3 digit numbers. See A Pg 45. Expanded decomposition only as in C. [ Recording as 50&7, not 50+7 ] AIM All children able to use empty number lines and most secure with Sec C, using 2-digit numbers. Decimals, including money A proposed progression with expectations for each ( The “average” child ) Year 4 Rapid recall Number bonds to 20. All complementary numbers within 100. UNDERSTAMDING OF THE NUMBER SYSTEM. Understand relationship between + & -. Understand commutative and associative laws. UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 10 000 and decimals in money and measures. Use of open number line. Year 6 Rapid recall Use known number facts and place value for rapid mental calculation. UNDERSTANDING OF THE NUMBER SYSTEM. Understand difference between positive and negative integers and 2 negative integers. Framework-Sec6-Pg 50 Framework-Sec6-Pg 51 Framework-Sec6-Pg 51 NOT NECESSARY to use compensation as a written method NOT NECESSARY to use compensation as a written method NOT NECESSARY to use compensation as a written method Teach expanded decomposition ( using “and” or & as in Y3) leading to compact method. See C. Also continue to use counting up with informal jottings when appropriate, eg subtracting from 1000’s or 100’s. Year 5 Rapid recall Decimal complements within 1 and 10. AIM Most children use compact decomposition when appropriate. 3-digit minus 3-digit / 3-digit minus 2-digit. Two or more 3-digit sums of money eg £4.20 - £3.87 Continue to develop compact decomposition with different numbers of digits and with decimals (See C, Pg 51) Children not confident from Y4 continue to use preferred reliable method. Teach C again when appropriate. Continue counting up with jottings, when appropriate. As in Y5 with increasingly complex numbers. AIM Most children able to use compact decomposition with all types of numbers, including decimals. AIM Most children able to use compact decomposition when appropriate. Subtracting two 3-digit numbers with 1 or 2 decimal places. Subtracting numbers with upto 4 digits and / or 1 or 2 dp. TIME :- Teach time, eg “45 minutes before 1:30” by counting back; use open number lines. Subtraction Remember it is far better to learn through using numbers in context than to learn methods in an abstract way and then attempt to apply them. e.g. There are 76 boys and 93 girls in Year 3. How many more girls than boys are there? Stage 3 (Year 3) may use blank number lines +4 +10 +3 _________________________________________ 76 80 90 93 + 4 takes us to the next multiple of 10 + 10 takes us to 90 + 3 takes us to 93 So there are 17 more girls than boys. Note Encourage checking by 76 + 17 The number line can be used throughout Year 3 (Stage 1) with number sentences written side by side. The garden centre had 104 rose bushes. During the spring it sold 67. How many are left? +3 +30 +4 ______________________________________________ 67 70 100 104 + 3 makes 70 +30 makes 100 + 4 makes 104 Check? Answer: - 37 rose bushes left. How? Record also as 104 – 67 = 37 Also teach partitioning and re-combining but no exchanges. e.g. 59 - 23 = 50 - 20 & 9 - 3 30 & 6 = 36 Stage 2 (Year 4) Negative Number method A 36 – 14 N.B. no exchanging. 36 = 30 & 6 partitioning and re-combining - 14 = 10 & 4 as in teaching of addition 20 + 2 = 22 B 52 – 17 52 = 50 & 2 -17 10 & 7 40 – 5 = 35 NB Teach as “the most I can take from 2 is 2. So I still need to take away 5, hence –5. Or teach using positive, negative number line. ___________________________________________ -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 2 - 7 = -5 C 754 – 329 754 = 700 & 50 & 4 -329 = 300 & 20 & 9 400 + 30 – 5 = 425 D 620 – 173 620 = 600 & 20 & 0 -173 = 100 & 70 & 3 500 -50 -3 = 447 Stage 3 (Year 5) Stay within 3 digit numbers, use “0” in the 10’s column and for those who are ready no partitioning by Summer Term. A B 704 = 700 & 0 & 4 322 = 300 & 20 & 2 400 - 20 & 2 = 382 702 -165 600 – 60 – 3 = 537 REMEMBER CHECK USING INVERSE 165 +537 702 Year 6 (Stage 4) Extend to 4/5 digit numbers. May be appropriate to recap and use partitioning/re-combining initially. A 14632 = 10000 & 4000 & 600 & 30 & 2 9847 = & 9000 & 800 & 40 & 7 10000 -5000 -200 -10 -5 To support children they may need to make jottings 5000 – 200 = 4800 – 10 4790 - 5 Ans 4785 Remember to encourage checking by using the inverse. B TTh Th H T U 1 4 6 3 2 9 8 4 7 1 - 5–2–1-5 10000 – 5000 – 200 – 10 – 5 4800 Ans 4785 This can only be done when pupil is thinking “number value” not digit. Year 6 (Stage 4) Decimals, partition/re-combine initially. A 63.4 = 9.7 = 60 & 3 & 0.4 9 & 0.7 60 -6 -0.3 Jottings needed B 75.23 18.79 54 – 0.3 Ans 53.7 = 70 & 5 & 0.2 & 0.03 = 10 & 8 & 0.7 & 0.09 60 - 3 - 0.5 - 0.06 57 – 0.5 = 56.5 – 0.06 Ans 56.44 C Only contract and have no jottings when confident and thinking “number value”. T U 2 7 . 5 3 - 9 . 4 6 2 – 2 .+1 - 3 20 – 2. +1 – 3 Ans 18.07 9.46 18.07 27.53 CHECK USING INVERS E NB Even when dealing with large numbers many children will be more confident if they write the real value of the numbers. e.g. 21007 -2986 20000 – 1000 – 900 – 80 1 Ans 18021 CHEC K Through all 4 stages children should be encouraged to check using inverse operation or a number line. CHEC K 2986 +18021 21007 +4 +10 18000 +7 _______________________________________________________ 2986 3000 21000 21007 Ans 18021 APPROACHES TO WRITTEN CALCULATIONS: year. Multiplication A proposed progression with expectations for each ( The “average” child ) Year 3 Rapid recall 2, 3, 4, 5, 10 x tables and corresponding multiplication and division facts. Year 4 Rapid recall 2, 3, 4, 5, 10, 6, 8 x tables and corresponding multiplication and division facts. Year 5 Rapid recall All x tables and corresponding multiplication and division facts. Year 6 Rapid recall All x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand grouping, sharing and arrays. Understand that multiplication can be done in any order. Recognise relationship between division and multiplication. Framework-Sec 5-Pg 57 UNDERSTANDING OF THE NUMBER SYSTEM. Understand commutative, associative and distributive laws in relation to multiplication. UNDERSTANDING OF THE NUMBER SYSTEM. Understand the effect of, and relationship between the four operations. UNDERSTANDING OF THE NUMBER SYSTEM. Understand the use of brackets Framework-Sec 6-Pg 66 Framework-Sec 6-Pg 67 Framework-Sec 6-Pg 67 No formal method but children should understand multiplicat’n as repeated addition and as describing an array. Continue with informal methods. eg 17 x 5 Teach grid method. See A. Use 2 /3 digit numbers. Progress to B, vertical, expanded recording, most significant digit first. Where appropriate teach compact standard method, B(ii) Continue expanded or grid method for those not confident. Progress to handling units first leading to ……….. Long multiplication ~ begin with grid method, See A. Compact standard method, See B. Compact method when appropriate, See B (iii) 17 10 x 5 = 50 7 x 5 =35 Decimals including money Teach compact method for those not confident in Y 5. Long multiplication ~ teach compact method when appropriate. Continue with grid method where this is more reliable. Use Napier’s Boxes as possible alternative to long multiplication. ( See example sheet ) TABLES:- Regular revision of all tables AIM Children can use compact short method with any number of digits. 85 TABLES 2, 3, 4, 5, 10 TABLES 2, 3, 4, 5, 10, 6, 8 TABLES 2, 3, 4, 5, 10, 6, 8, 9, 7 AIM Most confident with vertical, expanded method (B). Some able to use compact standard method. AIM Most children able to use compact method for short mult. of 4-digit numbers. Grid method for long mult. Compact method for simple decimals ( 1 dec. place ) eg 5.8 x 3 = Compact method for short mult’n. Chosen method for long. NAPIER’S BOXES Examples 1. 8 x 2 = 16 4. 46 x 25 = 1,150 6 4 8 6. 1 1 2 6 2 3 1 6 2. Answer: 16 1, 1 98 x 2 = 196 x 8 9 1 1 6 8 3. 47 x 9 = 423 2 4 7 3 4 3 6 2 3 9, 0 8 6 0 8 23.7 x 3.2 = 75.84 7 8 9 Write down 2, carry 1 which added to 3 4 x 2 9 6 2 1 8 2 3 x 6 1 9 4 3 2 2 5 2 4 6 7. x 1 4 4 2 4 2 1 6 9 1 2 2 1 784 x 37 = 29,008 8 6 4 3 0 7 x 1 1 0 5 5. 2 5 0 2 3 2 2 8 1 x x 13.2 x 24 = 316.8 1 1 7 4 7 1 5 2 6 8 3 4 4 APPROACHES TO WRITTEN CALCULATIONS: A proposed progression with expectations for each year. Division ( The “average” child ) Year 3 Rapid recall 2, 3, 4, 5, 10 x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand grouping, sharing, arrays. Recognise relationship between Multiplication and division. Year 4 Rapid recall 2, 3, 4, 5, 10, 6, 8 x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand relationship between division and subtraction. Understand rounding. Year 5 Rapid recall All x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand the quotient as a fraction or decimal. Year 6 Rapid recall All x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand the quotient as a fraction or decimal. Understand rounding, in context. Framework- Sec 5 – Pg 49/51 See these pages for skills to develop. No formal written methods. Framework- Sec 6 – Pg 68 Framework- Sec 6 – Pg 69 Framework- Sec 6 – Pg 69 Derive division facts for 2, 3, 4, 5, 10 x tables. Be secure at subtracting multiples of 10 from any given number eg 126 – 20/30/50 etc. Teach A, “using multiples of the divisor” ( chunking ) for repeated subtraction. [NB when chunking in 4’s may prefer to record “10 lots of 4” rather than 10 x 4] Continue to develop standard method B. Progress to subtracting 20/30/x divisor when appropriate. 6 )197 - 180 ( 30 lots of 6 ) etc. Progress to B. Do not write answer above bracket and again use term “lots of”. Progress to standard compact method B (ii) 6 )195 180 15 12 3 AIM Understand grouping and sharing; that division is inverse of multiplication. Record simple mental divisions in number sentences. Decimals, including money AIM Most children using chunking (B) able to divide 2 or 3-digit numbers by single digit numbers. Continue compact short division as in Yr5. See A. Progress to long division. See B 28 )763 560 ( 20 lots of 28 ) 203 140 ( 5 lots of 28 ) 63 56 (2 lots of 28 ) 7 Ans: 27 R 7 or 27 ¼ or 27.25 Ans: 32 R 3 or 32 ½ AIM Most children use compact method for short division. For those not secure continue B (i) Division of money. Relate remainders to fractions and decimals. AIM Children able to use appropriate short method for any number, including decimals: Some able to do long division. Extend methods to decimals with upto 2 dp. APPROACHES TO WRITTEN CALCULATIONS: Addition Rapid recall Number bonds to 20. Within 100, addition of any number to a multiple of 10. UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 100. Ability to partition within 100. Use of the open number line. Framework-Sec 5-Pg 43 Develop partitioning of numbers and use empty number lines with increasingly difficult numbers. Work calculations horizontally and vertically side by side working with most significant digit first. Year 3. Subtraction Multiplication Division Rapid recall Number bonds to 20. Within 1000, subtract any multiple of 100. UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 100. Ability to partition within 100. Use of the open number line. Rapid recall 2, 3, 4, 5, 10 x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand grouping, sharing and arrays. Understand that multiplication can be done in any order. Recognise relationship between division and multiplication. Framework-Sec 5-Pg 57 Rapid recall 2, 3, 4, 5, 10 x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand grouping, sharing, arrays. Recognise relationship between Multiplication and division. Framework-Sec5-Pg 45 NOT NECESSARY to use compensation as a written method. Develop counting on / back with empty number lines and shortened vertical method side by side, using 2 & 3 digit numbers. See A Pg 45. No formal method but children should understand multiplicat’n as repeated addition and as describing an array. Continue with informal methods. eg 17 x 5 17 Expanded decomposition only as in C. [ Recording as 50&7, not 50+7 ] 10 x 5 = 50 Framework- Sec 5 – Pg 49/51 See these pages for skills to develop. No formal written methods. Derive division facts for 2, 3, 4, 5, 10 x tables. Be secure at subtracting multiples of 10 from any given number eg 126 – 20/30/50 etc. 7 x 5 =35 85 AIM All children add two 2-digit numbers; some add two 3-digit numbers. AIM All children able to use empty number lines and most secure with Sec C, using 2-digit numbers. TIME :- Teach addition of time by counting on, use open number lines. TIME :- Teach time, eg “45 minutes before 1:30” by counting back; use open number lines. TABLES 2, 3, 4, 5, 10 AIM Understand grouping and sharing; that division is inverse of multiplication. Record simple mental divisions in number sentences APPROACHES TO WRITTEN CALCULATIONS: Addition Rapid recall Add strings of upto 4 numbers. Within 1000 addition of any number to a multiple of 10 or 100 UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 1000. Decimals in money (£1.36).Partition within 1000. Use of open number line. Year 4 Subtraction Division UNDERSTANDING OF THE NUMBER SYSTEM. Understand relationship between + & -. Understand commutative and associative laws. Rapid recall 2, 3, 4, 5, 10, 6, 8 x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand commutative, associative and distributive laws in relation to multiplication. Rapid recall 2, 3, 4, 5, 10, 6, 8 x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand relationship between division and subtraction. Understand rounding. Framework-Sec 6-Pg 48 Framework-Sec6-Pg 50 Framework-Sec 6-Pg 66 Framework- Sec 6 – Pg 68 NOT NECESSARY to use compensation as a written method. NOT NECESSARY to use compensation as a written method Begin expanded method, adding most significant digit first. See A. Rapid recall Number bonds to 20. All complementary numbers within 100. Multiplication Progress to handling least significant first. See C. Teach grid method. See A. Use 2 /3 digit numbers. Progress to B, vertical, expanded recording, most significant digit first. [This will prepare for carrying below the line ~ compact method.] Teach expanded decomposition ( using “and” or & as in Y3) leading to compact method. See C. Also continue to use counting up with informal jottings when appropriate, eg subtracting from 1000’s or 100’s. Progress to handling units first leading to ……….. Compact standard method, See B. Teach A, “using multiples of the divisor” ( chunking ) for repeated subtraction. [NB when chunking in 4’s may prefer to record “10 lots of 4” rather than 10 x 4] Progress to B. Do not write answer above bracket and again use term “lots of”. AIM Most children use compact method when appropriate, ie two 3-digit numbers or several numbers. (NOT two 2-digit numbers) AIM Most children use compact decomposition when appropriate. 3-digit minus 3-digit / 3-digit minus 2digit. Decimals, including money Two or more 3-digit sums of money eg £4.21 + £3.87 Two or more 3-digit sums of money eg £4.20 - £3.87 Decimals, including money TABLES 2, 3, 4, 5, 10, 6, 8 AIM Most confident with vertical, expanded method (B). Some able to use compact standard method. AIM Most children using chunking (B) able to divide 2 or 3-digit numbers by single digit numbers. APPROACHES TO WRITTEN CALCULATIONS: Year 5 Addition Rapid recall Add strings of upto 5 numbers. Subtraction Rapid recall Decimal complements within 1 and 10. UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 10 000 and decimals in money and measures. Use of open number line with decimals. Framework-Sec 6-Pg 49 UNDERSTANDING OF THE NUMBER SYSTEM. Place value to at least 10 000 and decimals in money and measures. Use of open number line. NOT NECESSARY to use compensation as a written method. NOT NECESSARY to use compensation as a written method Where appropriate teach compact standard method, B(ii) Continue to develop compact decomposition with different numbers of digits and with decimals (See C, Pg 51) Children not confident from Y4 continue to use preferred reliable method. Teach C again when appropriate. Continue counting up with jottings, when appropriate. Continue expanded or grid method for those not confident. Long multiplication ~ begin with grid method, See A. Compact method when appropriate, See B (iii) Framework-Sec6-Pg 51 Multiplication Rapid recall All x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand the effect of, and relationship between the four operations. Division Rapid recall All x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand the quotient as a fraction or decimal. Framework-Sec 6-Pg 67 Framework- Sec 6 – Pg 69 Use Carrying method. See C. For those not confident from Y 4 continue with A but teach C when appropriate. [If appropriate use expanded method A but handling least significant digit first for decimals.] AIM Most children able to use carrying by end of year; numbers upto 10 000 and decimals] AIM Most children able to use compact decomposition with all types of numbers, including decimals. Adding two or more 3-digit numbers with 1 or 2 decimal places. Subtracting two 3-digit numbers with 1 or 2 decimal places. Continue to develop standard method B. Progress to subtracting 20/30/x divisor when appropriate. 6 )197 - 180 ( 30 lots of 6 ) etc. Progress to standard compact method B (ii) 6 )195 180 15 12 3 3 or 32 ½ AIM Most children use compact method for short division. For those not secure continue B (i) TABLES 2, 3, 4, 5, 10, 6, 8, 9, 7 AIM Most children able to use compact method for short mult. of 4-digit numbers. Grid method for long mult. Compact method for simple decimals 1 dec. place ) eg 5.8 x 3 = Ans: 32 R ( Division of money. Relate remainders to fractions and decimals. APPROACHES TO WRITTEN CALCULATIONS: Addition Year 6 Subtraction Rapid recall Add strings of numbers Rapid recall Use known number facts and place value for rapid mental calculation. UNDERSTANDING OF THE NUMBER SYSTEM. Place value to any number of digits and 2 dp. Use of open number line with upto 2 dp. UNDERSTANDING OF THE NUMBER SYSTEM. Understand difference between positive and negative integers and 2 negative integers. Framework Sec 6-Pg 49 Framework-Sec6-Pg 51 NOT NECESSARY to use compensation as a written method. NOT NECESSARY to use compensation as a written method Multiplication Division Rapid recall All x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand the use of brackets Rapid recall All x tables and corresponding multiplication and division facts. UNDERSTANDING OF THE NUMBER SYSTEM. Understand the quotient as a fraction or decimal. Understand rounding, in context. Framework-Sec 6-Pg 67 Framework- Sec 6 – Pg 69 Teach compact method for those not confident in Y 5. Long multiplication ~ teach compact method when appropriate. As Yr 5 extending method to any number of digits and decimal places. As in Y5 with increasingly complex numbers. [Children not confident with carrying use expanded method.Teach C again when and if appropriate.] AIM Children use carrying method when appropriate. AIM Most children able to use compact decomposition when appropriate. Adding 2 or more numbers with upto 4 digits and / or 1 or 2 dp. Subtracting numbers with upto 4 digits and / or 1 or 2 dp. Continue with grid method where this is more reliable. Use Napier’s Boxes as possible alternative to long multiplication. ( See example sheet ) TABLES:- Regular revision of all tables AIM Children can use compact short method with any number of digits. Compact method for short mult’n. Chosen method for long. Continue compact short division as in Yr5. See A. Progress to long division. See B 28 )763 560 ( 20 lots of 28 ) 203 140 ( 5 lots of 28 ) 63 56 (2 lots of 28 ) 7 Ans: 27 R 7 or 27 ¼ or 27.25 AIM Children able to use appropriate short method for any number, including decimals: Some able to do long division. Extend methods to decimals with upto 2 dp. ALWAYS ASK: Can I do this in my head? Do I know the approximate size of the answer? What could I jot down to help me? Do I really need to do a written calculation?