Exercise 59 Page 152

Let's perform the addition.

6 + (- 18)

$a + (- b) = a - b$

6 - 18

Subtract term

- 12

Before we can evaluate our expression, we can rewrite the mixed number as a decimal.

12 \frac{1}{2} + (- 25) \Leftrightarrow 12.5 + (- 25)

Let's perform the addition.

12.5 + (- 25)

$a + (- b) = a - b$

12.5 - 25

Subtract term

- 12.5

Let's perform the addition.

- 9 + (- 9)

$a + (- b) = a - b$

- 9 - 9

Subtract term

- 18

Let's perform the addition.

- 12.2 + 6.1 + 15.8

Add terms

9.7

We can see that adding a positive number is the same as subtracting its negative counterpart. Below we will demonstrate by finding

- 12.2

and moving

6.1

units to the right on the number line.

3.2.1 Subtraction of Integers p.143-144

3.2.2 Connecting Addition and Subtraction p.147-148

3.2.3 Multiplication as Repeated Subtraction p.152

3.2.4 Multiplication of Decimals p.158

3.2.5 Addition, Subtraction, Multiplication, and Division of Integers p.161