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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. 0 6-6 Opposites

3 Negative Numbers Are Used to Measure Temperature

4 Negative Numbers Are Used to Measure Under Sea Level 0 10 20 30 -10 -20 -30 -40 -50

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 -$15.000 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. -2 +1 +2

10 INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents. -4 +4

11 INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents. -4 +5 -3

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 -3 + 4 = 6 – 10 = -6 + -7 = 12 + -7 = -3 – (-4) = 5 – (-9) = To use zero bank get out of slide show!

14 On your own -4 + 4 = -6 – 15 = -6 + 13 = 2 + -13 = -4 – (-4) = -9 – (-9) = Zero Bank


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