Subtract 21/81 from 15/10
1st number: 1 5/10, 2nd number: 21/81
15/10 - 21/81 is 67/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 10 × 81 = 810,
15/10 = 15 × 81/10 × 81 = 1215/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
21/81 = 21 × 10/81 × 10 = 210/810 - Subtract the two like fractions:
1215/810 - 210/810 = 1215 - 210/810 = 1005/810 - After reducing the fraction, the answer is 67/54
- In mixed form: 113/54
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