72 ---> 2 x 36
2x36 ---> 2 x 6 x6
2 x 6 x6 ---> 2 x 3 x 3x 3 -x3 good luck
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72 8,9 2,4,3,3 2,2,2,3,3
72 ^ 9x8 ^ ^ 3x3 4x2 ^ 2x2
72 36,2 18,2,2 9,2,2,2 3,3,2,2,2
72 ^ 3 24 ^ 3 8 ^ 2 4 ^ 2 2 Result is: 2x2x3x3=72 Make sure to use exponents If this is for school!
The GCF of 72 and 144 is 72. Since 72 is a factor of 144, it is automatically the GCF.