GCF- 8 16 2 8 16 2 4 8 2 2 4 1 2
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It doesn't matter what method you use, you need at least two numbers to find a GCF.
use division by primes to find the gcf
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For example we have 2 Nos. 24 & 36 .GCF =24)36(124------------12)24(224----------------0So the last divisor is the GCF of 24 & 36 which is 12 . And the above method is called successive division.
you can use multiplication facts to find division facts by dividing your divisor and your quotient to find your answer.