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Addition and Subtraction

Addition and Subtraction. Ex: 3 + 5 = 8. Commutative Property. Ex: 3 + 5 = 8. becomes 5 + 3=8 So 3 + 5 = 5 + 3. Associative Property. 3 + 5 = 2 + 6 = 1 + 7 = 4 + 4 =. Associative Property. What does this mean?.

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Addition and Subtraction

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  1. Addition and Subtraction Ex: 3 + 5 = 8

  2. Commutative Property Ex: 3 + 5 = 8 becomes 5 + 3=8 So 3 + 5 = 5 + 3

  3. Associative Property 3 + 5 = 2 + 6 = 1 + 7 = 4 + 4 =

  4. Associative Property What does this mean? • It means that if you need to make an addition problem easier, you can BORROW from one addend(number) to give to the other addend (number) to make it easier to calculate the SUM (answer). 5 + 3 7 + 1 8 + 0 4 + 4 6 + 2 1 + 7 2 + 6 3 + 5

  5. What does this mean? • It means that if you need to make an addition problem easier, you can BORROW from one addend (number) to give to the other addend (number) to make your calculation easier. 38 + 27 = 38 + (2 + 25) = (38 + 2) + 25 = 40 + 25 = 65

  6. Try these • 78 + 47 = • 39 + 94 = • 227 + 384= 78 + 47 78 + 45+ 2 80 + 45 78 + 45 + 2 =125 =133 =611 33 + 6 + 94 33 + 100 39 + 94 33 + 6 + 94 227 + 384 211 + 16 + 384 211 + 16 + 384 211 + 400

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