Subtract 81/8 from 3/15
1st number: 3/15, 2nd number: 10 1/8
3/15 - 81/8 is -397/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
3/15 = 3 × 8/15 × 8 = 24/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
81/8 = 81 × 15/8 × 15 = 1215/120 - Subtract the two like fractions:
24/120 - 1215/120 = 24 - 1215/120 = -1191/120 - After reducing the fraction, the answer is -397/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/15-81/8 3/30-81/8 3/15-81/16 9/15-81/8 3/45-81/8 3/15-81/24 3/75-81/8 3/15-81/40 21/15-81/8 3/15-81/56