Worked examples
Two examples
Example 1
4 + (−3) =
- Add a negative: the number goes down.
- From 4, go down 3.
Answer: 1
Example 2
4 − (−5) =
- Subtract a negative: the number goes up.
- From 4, go up 5.
Answer: 9
Where this is taught: Signed Numbers, Part 4: the four cases
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.