Subtract 15/81 from 12/7
1st number: 1 5/7, 2nd number: 15/81
12/7 - 15/81 is 289/189.
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,
12/7 = 12 × 81/7 × 81 = 972/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
15/81 = 15 × 7/81 × 7 = 105/567 - Subtract the two like fractions:
972/567 - 105/567 = 972 - 105/567 = 867/567 - After reducing the fraction, the answer is 289/189
- In mixed form: 1100/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/7-15/81 12/7-30/81 12/14-15/81 36/7-15/81 12/7-45/81 12/21-15/81 60/7-15/81 12/7-75/81 12/35-15/81 84/7-15/81 12/49-15/81