4.
24 = 23 x 3
36 = 22 x 32
64 = 26
hcf = 22 = 4
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The GCF is 2.
GCD: 4
The divisors of 16 are 2, 4 and 8. The divisors of 24 are 2, 3, 4, 8 and 12. Hence the GCD is 8.
36 and 64
If you have two numbers m and n and their gcd (or gcf), g then their LCM = m*n/g so LCM = 72*252/36 = 2*252 = 504.