64
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18
34 = 2x17 64 = 2x2x2x2x2x2 GCF = 2
The GCF of 18, 24 and 64 is 2. To find the GCF of three numbers you first need to break them down into their prime factors: 18=2x3x3 24=2x2x2x3 64=2x2x2x2x2x2 The next step is to identify the common prime factors. The only prime factor which all three numbers have is 2. Therefore the GCF of 18, 24 and 64 is 2.