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The prime factorisation of the two number is:

18 = 2*3*324 = 2*2*2*3


The HCF is the product every number which appears in both lists (repeated appearances mean repeated inclusion in HCF):

HCF = 2*3 = 6

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โˆ™ 2017-02-27 11:14:01
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โˆ™ 2017-02-27 12:24:42

It is 6 because it is the highest number that will go into 18 and 24 leaving no remainders

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Q: Find the Highest common factor (HCF) of 18 and 24. Show working.?
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