Subtract 81/49 from 21/15
1st number: 1 6/15, 2nd number: 1 32/49
21/15 - 81/49 is -62/245.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 49 is 735
Next, find the equivalent fraction of both fractional numbers with denominator 735 - For the 1st fraction, since 15 × 49 = 735,
21/15 = 21 × 49/15 × 49 = 1029/735 - Likewise, for the 2nd fraction, since 49 × 15 = 735,
81/49 = 81 × 15/49 × 15 = 1215/735 - Subtract the two like fractions:
1029/735 - 1215/735 = 1029 - 1215/735 = -186/735 - After reducing the fraction, the answer is -62/245
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-81/49 21/30-81/49 21/15-81/98 63/15-81/49 21/45-81/49 21/75-81/49