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To find the HCF of two numbers you first need to express them as the product of their prime factors. In this case you'd get:

45 = 3x3x5

60 = 2x2x3x5

The next step is to identify any common prime factors. In this case both numbers have a 3 and a 5 as a prime factor. Multiplying these together gives:

3x5 = 15

And so 15 is the HCF of 45 and 60.

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12y ago
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14y ago

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Q: What is the HCF of 60 and 45?
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