Subtract 15/7 from 12/81
1st number: 12/81, 2nd number: 2 1/7
12/81 - 15/7 is -377/189.
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,
12/81 = 12 × 7/81 × 7 = 84/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
15/7 = 15 × 81/7 × 81 = 1215/567 - Subtract the two like fractions:
84/567 - 1215/567 = 84 - 1215/567 = -1131/567 - After reducing the fraction, the answer is -377/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/81-15/7 12/81-30/7 12/81-15/14 36/81-15/7 12/81-45/7 12/81-15/21 60/81-15/7 12/81-75/7 12/81-15/35 84/81-15/7 12/81-15/49