Subtract 18/21 from 81/12
1st number: 6 9/12, 2nd number: 18/21
81/12 - 18/21 is 165/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
81/12 = 81 × 7/12 × 7 = 567/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
18/21 = 18 × 4/21 × 4 = 72/84 - Subtract the two like fractions:
567/84 - 72/84 = 567 - 72/84 = 495/84 - After reducing the fraction, the answer is 165/28
- In mixed form: 525/28
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