20 and 30, for one.
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Only if they're the same number. The LCM and GCF of 10 and 10 is 10.
Any two of the same number. The GCF and LCM of 10 and 10 is 10.
Only if you are comparing a number to itself. The GCF and LCM of 10 and 10 is 10.
10 and 63
The LCM will never be less than the GCF. To be a multiple of both numbers, the LCM will have to be equal to or greater than the larger number. To be a factor of both numbers, the GCF will have to be equal to or less than the smaller number. The only problem comes when you're comparing a number to itself. The LCM of 10 and 10 is 10. The GCF of 10 and 10 is 10.