1-7 Adding and Subtracting Integers

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Presentation transcript:

1-7 Adding and Subtracting Integers Miss Tilton

1-7 Adding Integers Examples: Adding zero does not change an integer: Zero property Examples: – 12 + 0 = – 12 0 + (– 88) = – 88

1-7 Adding Integers Adding integers with the same sign: Find the sum Keep the sign Find the sum of – 5 + – 2

1-7 Adding Integers Examples of addition with the same sign: 3 + 5 = 8 – 3 + (– 5) = – 8 – 50 + – 102 + – 5 = – 157 Try these… – 1 + (– 23) = – 5 + (– 2) + (– 7) = – 24 – 14

1-7 Adding Integers Adding integers with different signs: Find the difference (of the absolute values) Use the sign of the number with the larger absolute value Find the sum of – 4 + 5

1-7 Adding Integers Find the sum of 5 + (- 4)

1-7 Adding Integers Examples of addition with different signs: 9 + – 6 = 3 – 34 + 5 = – 29 – 49 + 54 + – 14 = – 14 Try these… 2 + (– 10) = 30 + – 5 21 + (– 39) = – 8 25 – 18

1-7 Adding Integers If you have no money on Monday. Your mom lets you borrow $ 8 on Tuesday, and you pay her back from the $ 10 you earn on Wednesday, how much money do you have?