Worked examples
Two examples
Example 1
12 − 20 =
- Rewrite: 12 + (−20).
- First subtract: 20 − 12 = 8. The original larger absolute value is −20, negative.
Answer: −8
Example 2
7 − (−8) =
- Rewrite: 7 + 8.
- Same signs: 15.
Answer: 15
Where this is taught: Signed Numbers, Part 8
The drill
Ten problems
How many:
Type each answer, then press Check my answers at the bottom. For a minus sign, the hyphen key (-) is fine.Write each answer on the line. The answer key, with the reasoning, is on the last page.