Subtract 81/7 from 12/15
1st number: 12/15, 2nd number: 11 4/7
12/15 - 81/7 is -377/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
12/15 = 12 × 7/15 × 7 = 84/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
81/7 = 81 × 15/7 × 15 = 1215/105 - Subtract the two like fractions:
84/105 - 1215/105 = 84 - 1215/105 = -1131/105 - After reducing the fraction, the answer is -377/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-81/7 12/30-81/7 12/15-81/14 36/15-81/7 12/45-81/7 12/15-81/21 60/15-81/7 12/75-81/7 12/15-81/35 84/15-81/7 12/15-81/49