List the factors of each number. Compare the lists to find the greatest number common to both. This is the HCF. Draw factor trees close for each number. Write each number as a product of its prime ...
Sometimes you are given numbers expressed as a product of prime factors. For example, 8 = 2 3 and 90 = 2 × 3 2 × 5. If you want to find the LCM and HCF in an exam, we can use prime factor form ...
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