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The HCF is: 27
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What is the greatest common factor of 28 amd 56?
28
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2
What is the greatest common factor of 12 amd 30?
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What is the LCM of 72 amd 108?
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What is the greatest common factor of 23 amd 36?
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What is the greatest common divisor of 135 amd 450?
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What is the greatest common of 21 amd 9?
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What is the GCF of 44 amd 45?
The greatest common factor of 42 and 45 is 3.Method 1: Listing Factors List all the factors of both numbers and the highest factor that is the same is the greatest common factor.Factors of 42: 1, 2, 3, 6, 7, 14, 21Factors of 45: 1, 3, 5, 9, 15The greatest common factor is 3.Method 2: Prime FactorizationFind the prime factorization of each number. The prime numbers that the numbers all share multiply to the great common factor.42=2*3*745=3*3*542 and 45 share one 3. Therefore, the greatest common factor is 3.
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