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Grade 4 Shapes Vocabulary: Acute angles Definition: Example: Smaller angles and less than 90° Right angles exactly 90° angles, think of corners on a table Obtuse angles Angles in between a right angle and a straight line. Equilateral Triangle A triangle that has 3 equal side lengths Isosceles Triangle A triangle with 2 sides that are equal and 1 that is not. Scalene Triangle A triangle that has no equal sides. Square Equal sides and all right angles Rectangle The opposite sides are equal, has only right angles Trapezoid 1 pair of opposite sides are parallel (or will never touch) Parallelogram Opposite sides are parallel. Parallelograms include squares and rectangles. 1 Grade 4 Math Resources Multiples and Factors Multiples= Example: multiples of 3 are 3,6,9,12,15,18,21….There is no ending for multiples. Factors= all numbers that a particular number can be divided by evenly Example: factors of 12 are 1,2,3,4,6, and 12 (1 x12, 2 x 6, 3 x 4) Least Common Multiple= the lowest multiple that is the same between two numbers Examples: The least common multiple of 4 and 6 is 12 because the multiples of 4 are 4,8,12,16… and the multiples of 6 are 6,12,18…, therefore the lowest one in common is a 12. Greatest Common Factor= the largest multiple that is the same between two numbers. Examples: The greatest common factor of 18 and 24 is 6 because the factors of 18 are 1,2,3,6,9, and 18. The factors of 24 are 1,2,3,4,6,8,12, and 24. Therefore, the largest one that they have in common is a 6. Fractions Numerator= top number in a fraction, the number of items that are shaded or the PART of the whole Denominator= bottom number in a fraction, the TOTAL number of items Example: XXX00 The fraction for X’s, is ⅗ the fraction for 0’s is ⅖. Equivalent Fractions= any two fractions that are equal *To find an equivalent fraction, multiply both the top and bottom numbers by the SAME number, other than 0 or 1, OR divide both the top and bottom number by the SAME number. Example: 1/4 x 2/2 = 2/8 Simplest Form= a way to write a fraction using the lowest possible numbers *To find the simplest form, divide BOTH the top and bottom numbers by any common factor other than 0 or 1. Continue to divide by common factors, until you cannot divide by anything other than 0 or 1. 2 Grade 4 Example: 24/32 The factors of 24 are 1,2,3,4,6,8,12, and 24. The factors of 32 are 1,2,4,8,16, and 32. You could divide by 24/32 by 2/2 and get 12/16, then divide 12/16 by 2/2 and get 6/8, then divide 6/8 by 2/2 and get 3/4. Or, you could divide 24/32 by 4/4 and get 6/8, and then divide 6/8 by 2/2 and get 3/4. Or, you could divide 24/32 by 8/8 and get 3/4. Fraction/decimal pairings your student should know. = 0.25 = 0.33 = 0.5 = 0.66 = 0.75 = 0.2 = 0.6 = 0.4 = 0.8 Mean, Median, Mode, and Range 3,5,6,8,8 Mean= The average number in a set of data. To find the average, you add all the numbers together and divide by the however many numbers you added. For example, the mean for the above set is 3+5+6+8+8=30 and 30 divided by 5 (because there are 5 numbers) is 6. Therefore, the mean is 6. Median= When you order a set of numbers from least to greatest, the median is the middle number. Example: In the above set, the number in the middle is 6, so the median is 6. Mode= The mode is the number that occurs the most often in a set of numbers. Example: In the set above, the number that occurs the most is 8, therefore the mode is 8. Range= In a set of numbers, the range is the difference between the largest and smallest numbers. For the set above, you would subtract the largest (8) minus the smallest (3), therefore 8 – 3 = 5 and the range is 5. 3 Grade 4 All Subjects www.kidinfo.com (Includes resources for both students and parents) www.henryanker.com (Math, Reading, Language Arts Activities) www.pbskids.org (Lower level games, K-2) www.starfall.com (K-2 Reading and Calendar Skills) www.professorgarfield.com (K-2 All Subjects) http://sitesgoogle.com/site/cclibrarymc/ (Multiple Grade Levels and Subjectss) http://homeschooling.about.com/od/freeprintables/u/printables.htm#s4 (free printables) www.freerice.com (Math, Reading, Science) www.sheppardsoftware.com (All subjects) Math www.homeschoolmath.net www.multiplication.com www.abcya.com www.coolmathgames.com http://resources.oswego.org/games/mathmagician/cathymath.html http://aplusmath.com http://jmathpage.com http://www.visualfractions.com http://www.ixl.com/math/grade-4 http://www.globalclassroom.org/rulergame200/index.html 4 Grade 4 Reading www.readtomelv.com http://resources.kaboose.com/games/read2.html http://www.ehow.com/list_6719046_cool-reading-games-kids.html Social Studies http://www.usconstitution.net/constkids4.html http://www.congressforkids.net/games/billofrights/2_billofrights.htm http://www.congressforkids.net/Constitution_threebranches.htm www.timeforkids.com www.pibmug.com/files/map_test.swf (Map game of United States) Science http://www.sciencenewsforkids.org/ http://www.sciencekids.co.nz/ http://www.sciencewithme.com/ http://kids.yahoo.com/science Miscellaneous www.edmodo.com (connects parents, students, and teachers, like a blog) 5