Step-by-step explanation:
54 = 9 x 6 = 3 x 3 x 6
153 = 9 x 17 = 3 x 3 x 17
We see that 3 x 3 = 9 shows up in each factorization, which is the largest common factor between the numbers. Therefore, the GCF is 3 x 3
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