Subtract 90/21 from 18/56
1st number: 18/56, 2nd number: 4 6/21
18/56 - 90/21 is -111/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
18/56 = 18 × 3/56 × 3 = 54/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
90/21 = 90 × 8/21 × 8 = 720/168 - Subtract the two like fractions:
54/168 - 720/168 = 54 - 720/168 = -666/168 - After reducing the fraction, the answer is -111/28
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