Fundamentals of Math - old

Fundamentals of Mathematics

Therefore, we can conclude −2 + 5 is equal to 3.

Figure 1.4.1 Adding/Subtracting Integers on a Number Line

If you have two signs written next to one another, for example, −3 + (−2) you must first turn the double signs into one.

• Double negatives make a positive −(−) = + • A negative and a positive make a negative +(−) = − or −(+) = −

So −3 + (−2) = −3 − 2 = −5 .

Practice 1.4.1 Directions: Identify the sum or difference of each expression.

1. −2 − 5

2. −3 − (−2)

3. 6 + 3

4. 15 + (−21)

5. 15 + 0

6. 5 + (−10)

7. −12 + 16

8. 5 − (−4)

9. 8 − 4

10. −(−14) − 7

Answer Key on Page 116

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