Subtract 63/21 from 81/28
1st number: 2 25/28, 2nd number: 3 0/21
81/28 - 63/21 is -3/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
81/28 = 81 × 3/28 × 3 = 243/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
63/21 = 63 × 4/21 × 4 = 252/84 - Subtract the two like fractions:
243/84 - 252/84 = 243 - 252/84 = -9/84 - After reducing the fraction, the answer is -3/28
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