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

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Presentation on theme: "ADDING & SUBTRACTING INTEGERS by Angela Gallacher NS 1.2 and AF 1.3."— Presentation transcript:

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

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

3 Negative Numbers Are Used to Measure Temperature

4 Negative Numbers Are Used to Measure Under Sea Level

5 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.

6 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

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

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

9 INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents

10 INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents

11 INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents

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

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

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


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