Download Section 9.4

Sections 9.4 (Subtraction of Real Numbers)
SUBTRACTION
 Subtraction is basically the same as adding the additive inverse (opposite) of numbers
 The additive inverse of a number is found by changing the sign of the number
Example: Find the additive inverse of 13, -7, 0.1,
1
(a number plus its additive inverse is always 0)
2
Examples:
3–7=

1 2
 
3 3
4 – (-9) =
-10 – 4.5 =
3 7
- =
7 2
Solve –x + 3 + (-4) - 7 where x is -2 and also when x = 6
The fictional temperature in Huntsville last Monday was 91o. During the week the temperature raised
2o, lowered 1o, raised 2o, and raised 1o. What was Saturday’s high?
Work through online HW Problems as time allows
Book problems: 1, 11, 26, 54, 55, 65, 69, 94, 96, 97