Subtract 42/81 from 84/7
1st number: 12 0/7, 2nd number: 42/81
84/7 - 42/81 is 310/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 7 × 81 = 567,
84/7 = 84 × 81/7 × 81 = 6804/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
42/81 = 42 × 7/81 × 7 = 294/567 - Subtract the two like fractions:
6804/567 - 294/567 = 6804 - 294/567 = 6510/567 - After reducing the fraction, the answer is 310/27
- In mixed form: 1113/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/7-84/81 84/14-42/81 84/21-42/81 84/35-42/81 84/49-42/81