By Lucille Caron
E-book through Caron, Lucille, St Jacques, Philip M.
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Extra info for Addition and Subtraction (Math Success)
Janice VanCleave’s Math for Every Kid: Easy Activities that Make Learning Math Fun. , 1991. Internet Addresses CANITech. Flashcards for Kids. © 1999. edu4kids. com/math>. Manura, David. Dave’s Math Tables. © 1999.
Subtraction Properties As you read on page 18, there are three basic addition properties: 1. Commutative Property 2. Associative Property 3. Zero Property Do these properties hold true for subtraction? Commutative Property The commutative property of addition allows you to add two numbers in any order you choose without affecting the sum. The sum of 7 plus 6 is the same as the sum of 6 plus 7. 7ϩ6ϭ6ϩ7 13 ϭ 13 Addition is commutative. Is subtraction commutative? Use the same example. Is the difference of 7 Ϫ 6 the same as the difference of 6 Ϫ 7?
Subtract ᎏ3ᎏ Ϫ ᎏ2ᎏ 4 3 Step 1: Find the least common denominator (LCD) by finding the least common multiple of the denominators. multiples of 4: multiples of 3: 4, 8, 12, 16, . . 3, 6, 9, 12, 15, . . LCD ϭ 12 Placing the least common multiple in the denominator of two fractions makes it the LCD. 3 ? 3ϫ3 9 Step 2: Write equivalent fractions ᎏᎏ ϭ ᎏᎏ ϭ ᎏᎏ ϭ ᎏᎏ 4 12 12 12 using the LCD. How many 4s are there in 12? (3). Multiply numerator by 3 (3 ϫ 3 ϭ 9). 2 2ϫ4 ? 8 How many 3s are there in ᎏᎏ ϭ ᎏᎏ ϭ ᎏᎏ ϭ ᎏᎏ 3 12 12 12 12?