The HCF are
<h3>What is HCF?</h3>
This is the common factor that is the highest that a group of numbers can have in common.
1. 6 and 15
factors of 6 = 1, 2, 3, 6
factors of 15: 1, 3, 5, 15
The HCF is the number they have in common = 3
2. 12 and 18
The factors of 12: 1, 2, 3, 4, 6, 12
The factors of 18: 1, 2, 3, 6, 9, 18
The HCF = 6
3. 15 and 24
Factors of 15: 1, 3, 5, 15
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
The HCF = 3
4. 24 and 36
The factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
The factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
The HCF : 12
5. 30 and 48
The factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
The factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
The HCF = 6
6. 36 and 54
The factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
The factors of 54: 1, 2, 3, 6, 9, 18, 27, 54
The hcf = 18
7. 32,40 and 56
The factors of 32: 1, 2, 4, 8, 16, 32
The factors of 40: 1, 2, 4, 5, 8, 10, 20, 40
The factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
The HCF is 8
8. 28,42 and 70
The factors of 28: 1, 2, 4, 7, 14, 28
The factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
The factors of 70: 1, 2, 5, 7, 10, 14, 35, 70
The HCF = 14
9. 30,75 and 90
The factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
The factors of 75: 1, 3, 5, 15, 25, 75
The factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
The HCF is 15
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