Subtract 80/36 from 54/21, Solve 2 12/21

Subtract 80/36 from 54/21

1^st number: 2 12/21, 2^nd number: 2 8/36

54/21 - 80/36 is 22/63.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 21 × 12 = 252,
54/21 = 54 × 12/21 × 12 = 648/252
Likewise, for the 2nd fraction, since 36 × 7 = 252,
80/36 = 80 × 7/36 × 7 = 560/252
Subtract the two like fractions:
648/252 - 560/252 = 648 - 560/252 = 88/252
After reducing the fraction, the answer is 22/63

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