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LCM and HCF from prime factoriation

Find the prime factorisation of 2 numbers and use that to find the Lowest Common Multiple (LCM) and Highest Common Factor (HCF) of two numbers

Range of numbers

Numbers from 10 to 30
Numbers from 10 to 50
Numbers from 10 to 100
Numbers from 10 to 100
Numbers from 10 to 200

Number of problems

3 problems (enough space on the worksheet to do it there)
10 problems (working out will have to be done elsewhere)

Answer sheet

Include answer sheet.
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