Worked examples
Two examples
Example 1
Rewrite as an addition: 7 − (−2)
- Keep the first number, 7. Change − to +. Change the sign of the second number: −2 becomes 2.
Answer: 7 + 2
Example 2
Rewrite as an addition: 3 − 8
- The second number, 8, has no sign of its own, so it is positive.
- Keep 3. Change − to +. Change 8 to −8.
Answer: 3 + (−8)
Where this is taught: Signed Numbers, Part 7: Rule 3
The drill
Ten problems
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.