Commutative Property of Addition For all real numbers

Commutative Property of Addition For all real numbers a and b a+b=b+a Commutative Property of Multiplication For all real numbers a and b a b=b a http: //www. youtube. com/watch? v=APOOI 5 Tr. R 9 E&NR=1 Example:

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Associative Property of Addition For all real numbers a, b and c (a + b) + c = a + (b + c) Associative Property of Multiplication For all real numbers a, b and c (a b) c = a (b c) Examples: Place the parenthesis to illustrate the associative property, then do the math and solve the problem. 1. 12 + 37 + 78 = 12 + 37 + 78 2. 54 + 36 + 14 = 54 + 36 + 14 3

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Distributive Property of Multiplication Over Addition and Subtraction For all real numbers a, b and c: a(b +c) = ab + ac and (b + c)a = ba + ca and a(b - c) = ab - ac and (b - c)a = ba - ca 5

Examples 1. 4(15) Step 1: Break the term inside the parenthesis into addends that are easier to work with 3. 6(125) Step 2: Distribute the term on the outside of the parenthesis to each addend Step 3: Do the math and add the terms together to get the final answer Use the distributive property to find the cost of renting a river tube for 8 hours at $4. 75 per hour. Find the cost of renting a river tube for 7 hours at $5. 50 per hour. 6

Properties of Equality For all real numbers a, b and c: Reflexive Property: a = a (A number is equal to itself) Symmetric Property If a = b, then b = a Transitive Property If a = b and b= c then a = c Substitution Property If a = b, then a can replace b, and b can be replaced by a 7