To find the factor pairs for 63, we need to identify pairs of whole numbers that, when multiplied together, equal 63.
Here are the pairs from your options:
- 2 × 126: No, this equals 252.
- 3 × 21: Yes, this equals 63.
- 4 × 13: No, this equals 52.
- 4 × 16: No, this equals 64.
- 7 × 9: Yes, this equals 63.
So the correct factor pairs for 63 from your options are:
- 3 × 21
- 7 × 9