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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. -6 6 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**

30 20 10 -10 -20 -30 -40 -50

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**Negative Numbers Are Used to Show Debt**

Let’s 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 -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. +1 -2 +2

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**INTRODUCTION TO INTEGERS**

Tell which integer each group of tiles represents. -1 -4 +4

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**INTRODUCTION TO INTEGERS**

Tell which integer each group of tiles represents. +5 -4 -3

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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 -3 + 4 = 6 – 10 = Zero Bank -6 + -7 = 12 + -7 = -3 – (-4) =**

5 – (-9) = Zero Bank To use zero bank get out of slide show!

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**On your own -4 + 4 = -6 – 15 = Zero Bank -6 + 13 = 2 + -13 =**

-4 – (-4) = -9 – (-9) = Zero Bank

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