Subtract 3/81 from 72/7
1st number: 10 2/7, 2nd number: 3/81
72/7 - 3/81 is 1937/189.
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,
72/7 = 72 × 81/7 × 81 = 5832/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
3/81 = 3 × 7/81 × 7 = 21/567 - Subtract the two like fractions:
5832/567 - 21/567 = 5832 - 21/567 = 5811/567 - After reducing the fraction, the answer is 1937/189
- In mixed form: 1047/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/7-6/81 72/14-3/81 72/7-9/81 72/21-3/81 72/7-15/81 72/35-3/81 72/7-21/81 72/49-3/81