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ADDING & SUBTRACTING INTEGERS by Angela Gallacher NS 1.2 and AF 1.3

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Integers Whole numbers and their opposites are integers such as 6 and -6. Zero is also a whole number Opposites

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Negative Numbers Are Used to Measure Temperature

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Negative Numbers Are Used to Measure Under Sea Level

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Negative Numbers Are Used to Show Debt Lets say your parents bought a car but had to get a loan from the bank for $15,000.When counting all their money they add in -$ to show they still owe the bank.

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INTRODUCTION TO INTEGERS We can represent integers using red and yellow counters. Red tiles will represent negative integers, and yellow tiles will represent positive integers. Negative integer Positive integer

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INTRODUCTION TO INTEGERS The diagrams below show 2 ways to represent -3. Represent -3 in 2 more ways. -3

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INTRODUCTION TO INTEGERS You may represent -3 by using 3 red tiles and any number of groups of +1 and -1 tiles

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INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents

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INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents

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INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents

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INTRODUCTION TO INTEGERS If there are the same number of red tiles as yellow tiles, what number is represented? It represents 0.

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Zero Pairs Zero Bank = 6 – 10 = = = -3 – (-4) = 5 – (-9) = To use zero bank get out of slide show!

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On your own = -6 – 15 = = = -4 – (-4) = -9 – (-9) = Zero Bank

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