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20/27 Solution Method: 40 = 2*2*2*5 (<-- these are the factors of 40) --- 54 = 2*3*3*3 (<-- these are the factors of 54) The only common factors in both the numerator & the denominator are 2. That means you can divide 40 by 2 & 54 by 2 to get 20/27.
The common factors of 12 and 54 are 1, 2, 3, and 6.
54
The common factors of 60 and 54 are 1, 2, 3, and 6.
Common factors of 36 and 54 are: 1, 2, 3, 6, 9, and 18.