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1 ; 12/1 16/1 18/1
but if you mean you have three fractions and one is 1/12 one is 1/16 and one is 1/18
factorization will help find the LCM to use as the common denominator
12 is 2*2*3
16 is 2*2*2*2
18 is 2*3*3
so the LCM is 2*2*2*2*3 *3 or 144
so 1/12 = 12/144
1/16 = 8/144
1/18= 6 /144
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