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Highest Common
Factor
- The highest FACTOR that 2 numbers have in common is called the highest common factor (HCF)
- e.g find the HCF of 60 and 84:
- 60
- 2
- 30
- 2
- 15
- 3
- THESE ARE PRIME NUMBERS.
- THESE ARE PRIME NUMBERS.
- 5
- 3
- 2
- 2
- 84
- 2
- 42
- 2
- 21
- 3
- 7
- THESE ARE PRIME NUMBERS.
- THESE ARE PRIME NUMBERS.
- 3
- 2
- 2
- 60=2x2x3x5
- Now circle the common factors. These are: 2x2x3=12
- The HCF of 60 and 84=12
- The HCF of 60 and 84=12
- Now circle the common factors. These are: 2x2x3=12
- 84=2x2x3x7
- 60
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