Subtract 42/7 from 1/81
1st number: 1/81, 2nd number: 6 0/7
1/81 - 42/7 is -485/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 7 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
1/81 = 1 × 7/81 × 7 = 7/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
42/7 = 42 × 81/7 × 81 = 3402/567 - Subtract the two like fractions:
7/567 - 3402/567 = 7 - 3402/567 = -3395/567 - After reducing the fraction, the answer is -485/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/81-42/7 1/81-84/7 1/81-42/14 3/81-42/7 1/81-42/21 5/81-42/7 1/81-42/35 7/81-42/7 1/81-42/49