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The HCF is the Highest Common Factor.

Working it out:

1. Choose two numbers and list all the factors of each number in a straght line like this:

20: 1, 2, 4, 5, 10, 20

15: 1, 3, 5, 15

2. find the highest number that appears in both lines. In this case the answer is 5.

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Q: What is HCF and how do you work it out?
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