Subtract 81/21 from 81/16
1st number: 5 1/16, 2nd number: 3 18/21
81/16 - 81/21 is 135/112.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 21 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 16 × 21 = 336,
81/16 = 81 × 21/16 × 21 = 1701/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
81/21 = 81 × 16/21 × 16 = 1296/336 - Subtract the two like fractions:
1701/336 - 1296/336 = 1701 - 1296/336 = 405/336 - After reducing the fraction, the answer is 135/112
- In mixed form: 123/112
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