1. Algebra 1
Section 1.4

2. Definition
Subtraction is defined as adding the opposite: For any real numbers a and b,
a – b = a + (-b)

3. Subtraction The number being subtracted from is called the minuend.
The number being subtracted is called the subtrahend.
The answer is called the difference.

4. Example 1 a. 4 – (-2) = ____ b. -3 – 2 = ____ c. 2 – 5 = ____ 6 -5 -3
4 + 2
-3 + (-2)
2 + (-5)

5. Example 2 a. 39.27 – 112.6 = ______ b. 2.39 – (-14.682) = ______ c.
-73.33
17.072 3 4 2 = 17 12
(-112.6) 3 4 2 +

6. Example 2 3 32 5 8 = 17 32 d. 3 32 5 8 +

7. should be simplified to
Simplifying
3 + (-5) – (-9) – 4 [-(-5)]
should be simplified to
3 – – 4 – 5
and thought of as
3 + (-5) (-4) + (-5)

8. Example 3
|-3| – (-4) + (-2) + 9 – [-(-7)]
3 + 4 – – 7
-2 + 9 7

9. Homework: pp