Highest Common Factor
Maths: Edexcel GCSE Higher, topic 1.16.1
Highest Common Factor (HCF)
The highest common factor is the highest factor that two numbers have. How to find the highest common factor (HCF) of 21 and 28:
Write the factors of 21
Write the factors of 28
HCF is the highest number which appears in both lists: 7
Test yourself on Highest Common Factor
Factors of 18