1. Subtracting Real Numbers
Section 1.7
Subtracting Real Numbers

2. To Subtract… Change it! Change the problem to ADD the OPPOSITE
(Keep, Change, Change)
Keep the 1st number the same,
Change the – to +
Change then 2nd number to its opposite
Then… follow addition rules

3. Subtract 1) -8 - 2 2) 0 - (-3) 3) -8 - (-3) 4) 9 – (-9)1)
2) 0 - (-3)
3) (-3)
4) 9 – (-9)
5) (-13.9)
6) 8/9 - (-1/3)
7) -11/27 - (-7/9)

4. Evaluate 8) 5 + (-7) + (-8) 9) (-4) + (-2) + (-15) + (-27)
8) 5 + (-7) + (-8)
9) (-4) + (-2) + (-15) + (-27)
10) 4 – – (-5) + (-3) - 29