Download Multiplication DIVISION Short Division (a)7 28 (b) 28 = 4 (c) 4 04 7 7

Multiplication
Short Multiplication
8
9
X 3
x 7
24
63
Different terms are used for multiplication such as
: multiply, times, product, groups of, multiply by
and lots of.
(b)
3 7
X 246
212 2
+7 4 0
962
Short Division
(a)7 28
(b)
04
28 = 4
7
(c)
4
7 28
Different terms are used for division such as : into,
divide by, how many in, divide into, share, group,
fraction of.
In our school we use INTO and DIVIDED BY
LONG MULTIPLICATION
(a)
DIVISION
53
x 315
265
+1 519 0
1855
Long multiplication is multiplying by a 2 digit
number. In example (a) above we begin by
multiplying by the right hand digit 6. When we
carry a number on to the next column we place it
at the bottom of the column. In example (a) the 4
is being carried and is put on the bottom. In
example (b) the 1 is being carried and placed at
the bottom.
Before we begin to multiply by the left digit we
put a zero on the second line. In the examples the
2 in 26 represents twenty and the 3 in 35
represents thirty. Therefore we place a zero on
the lower line and then continue to multiply by
the left digit as normal.
We then add the two new columns as in the
examples.
e.g. 7 into 28
28 divided by 7
LONG DIVISION
The concept of long division can prove difficult for
pupils but the key is to take one number at a time
(one step at a time)
In example (a) below we say 36 into 8 does not go so
we put a zero over the 8 and now we have 82. We
ask how many times 36 goes into 82 and we find out
that it goes in 2 times. We put the 2 over the 2 and
write in 72 (36x2) and subtract it from 82 leaving 10.
We bring down the final digit 8. We ask how many
times 36 fits into 108. We find out that it goes in 3
times. We put the 3 above the 8 and write in 108
(36x3) and subtract. We get 0 or in other sums you
may sometimes have a remainder.
(a)
023
36 828
- 72
108
- 108
000
Parents’ Guide to Maths
Dear Parent/Guardian,
This brochure deals with the basic maths language
we use in St. Patrick’s B.N.S. We hope it will show
you how mathematics are taught in our school.
This booklet is to help you to understand and assist
your son in his maths work in the key areas of
Addition, Subtraction, Multiplication and Division.
Useful Maths Websites
www.scoilnet.ie
www.bbc.co.uk
www.amathsdictionaryforkids.com
www.coolmath4kids.com
COPYBOOK – USE PROPER MATHS COPIES
It is important that pupils keep their copybooks
neat and tidy and observe the classroom rules in
this regard. This helps you and the teacher see the
areas where he needs help.Usually copybooks are
ruled into two sections with a margin across the top
of the page and at the side.
Date:
LEARNING TABLES
We believe that learning tables by rote (off by
heart) is a basic skill of maths and we begin it
from 1st class in our school. To help your son we
use the following language…..
2+0=2
2+1=3
2+2=4
2+3=5
2+4=6
ADDITION
two plus zero is two
two plus one is three
two plus two is four
two plus three is five
two plus four is six
ADDITION
3
+4
7
7
+5
12
9
+6
15
Different terms exist for the concept of addition,
including the following : Add, Plus, And, Sum of,
Increase, Together, More, Total.
Your son may meet any of these in his maths books
but we usually use the following
PLUS
We say 3 plus 4
2-2=0
3-2=1
4-2=2
5-2=3
6-2=4
SUBTRACTION
two take two is zero
three take two is one
four take two is two
five take two is three
six take two is four
2x0=2
2x1=2
2x2=4
2x3=6
2x4=8
MULTIPLICATION
two noughts are nothing
two ones are two
two twos are four
two threes are six
two fours are eight
2÷2=1
4÷2=2
6÷2=3
8÷2=4
10÷2=5
DIVISION
two divided by two is one
four divided by two is two
six divided by two is three
eight divided two is four
ten divided by two is five
Addition of 2 Digit Numbers
(a)
(b)
75
+316
111
97
+418
145
When we add two or more numbers together and our
answer is greater than 10 we have to carry a number
onto the next column. In example (a) 5 plus 6 is
eleven. We put down 1 and carry 1. In example (b)
we say 7 plus 8 is 15 we put down 5 and carry 1.
When we carry a number we put it at the bottom of
the next column and NOT at the top.
SUBTRACTION
(a)
7
- 4
(b)
9
- 5
Different terms exist for subtraction such as
Minus, Take Away, Less, Difference, Subtract,
take from, decrease, fewer and reduce.
In our school we work from the top number
and say 7 takeaway 4.
Subtraction of two or more Digit Numbers
(a)
(b)
7 5
57 6
-3 8
-3 5 4
3 7
2 2 2
In this area of Mathematics we use a system
called
REGROUPING or RENAMING.
In example (a) We say : 5 take 8, you cannot do.
Cross out 7, write down the 6, carry the 1.
15 take 8 equals 7.
6 take 3 equals 3.
The same process is used when we are
subtracting Hundreds, Tens and Units.
In example (b) there is no REGROUPING as all
the bottom numbers are smaller than the top
numbers.