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Maxine
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ProfessorTo find the LCM of 56 and 42, you first have to break them down into their prime factors:
56 = 2x2x2x7
42 = 2x3x7
The next step is to work out the HCF. In this case that will be 2x7 = 14. Finally, you multiply the numbers together and divide by the HCF. 56x42/14 = 168. Therefore the LCM of 56 and 42 is 168.
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what is the gcf of 78 and 56
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