1.2.5

Highest Common Factors

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Highest Common Factor (HCF)

The highest common factor is the highest factor that two numbers have. What is the highest common factor (HCF) of 21 and 28?

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HCF

  • The HCF is the highest number that appears in both lists.
    • The HCF of 21 and 28 is 7.

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1Number

1.1Place Value

1.2Factors & Multiples

1.3Operations

1.4Fractions, Decimals & Percentages

1.5Growth & Decay

1.6Measurements & Units

1.7Accuracy

2Algebra

3Ratio, Proportion & Rates of Change

4Geometry & Measures

5Probability

6Statistics

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