Subtract 28/8 from 54/21
1st number: 2 12/21, 2nd number: 3 4/8
54/21 - 28/8 is -13/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
54/21 = 54 × 8/21 × 8 = 432/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
28/8 = 28 × 21/8 × 21 = 588/168 - Subtract the two like fractions:
432/168 - 588/168 = 432 - 588/168 = -156/168 - After reducing the fraction, the answer is -13/14
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