Subtract 70/14 from 81/21
1st number: 3 18/21, 2nd number: 5 0/14
81/21 - 70/14 is -8/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
81/21 = 81 × 2/21 × 2 = 162/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
70/14 = 70 × 3/14 × 3 = 210/42 - Subtract the two like fractions:
162/42 - 210/42 = 162 - 210/42 = -48/42 - After reducing the fraction, the answer is -8/7
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