Subtract 1/81 from 42/20
1st number: 2 2/20, 2nd number: 1/81
42/20 - 1/81 is 1691/810.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
42/20 = 42 × 81/20 × 81 = 3402/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
1/81 = 1 × 20/81 × 20 = 20/1620 - Subtract the two like fractions:
3402/1620 - 20/1620 = 3402 - 20/1620 = 3382/1620 - After reducing the fraction, the answer is 1691/810
- In mixed form: 271/810
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