Subtract 50/21 from 9/54, Solve 9/54

Subtract 50/21 from 9/54

1^st number: 9/54, 2^nd number: 2 8/21

9/54 - 50/21 is -31/14.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 54 × 7 = 378,
9/54 = 9 × 7/54 × 7 = 63/378
Likewise, for the 2nd fraction, since 21 × 18 = 378,
50/21 = 50 × 18/21 × 18 = 900/378
Subtract the two like fractions:
63/378 - 900/378 = 63 - 900/378 = -837/378
After reducing the fraction, the answer is -31/14

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