Subtract 18/21 from 81/24
1st number: 3 9/24, 2nd number: 18/21
81/24 - 18/21 is 141/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
81/24 = 81 × 7/24 × 7 = 567/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
18/21 = 18 × 8/21 × 8 = 144/168 - Subtract the two like fractions:
567/168 - 144/168 = 567 - 144/168 = 423/168 - After reducing the fraction, the answer is 141/56
- In mixed form: 229/56
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