Lesson 3
Negative Numbers
Real values of less than nothing
Page 106
The problem was 8 − ( − 6) . You either added without changing the sign of the number being subtracted, or changed the sign and then subtracted anyway. You must do both : change the sign of the number being subtracted, and add instead of subtract.
Here is the way it should be done:
sign changed
↓
8 − ( − 6) = 8
+
( + 6)
= ?
↑
add instead of subtract
Now it’s easy, isn’t it? Return to Page 103 and try again.
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