- Factors of 21: 1, 3, 7, 21
- Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
- Common factors of 21 and 24: 1, 3
- Factors of 16: 1, 2, 4, 8, 16
- Factors of 20: 1, 2, 4, 5, 10, 20
- Common factors of 16 and 20: 1, 2, 4
- Factors of 21: 1, 3, 7, 21
- Factors of 49: 1, 7, 49
- Common factors of 21 and 49: 1, 7
- Factors of 15: 1, 3, 5, 15
- Factors of 18: 1, 2, 3, 6, 9, 18
- Common factors of 15 and 18: 1, 3
- Left section label: Factors of 12
- Right section label: Factors of 10
- Overlapping section label: Common Factors of 12 and 10
Parent Tip: Review the logic above to help your child master the concept of common factors math worksheet.