Subtract 49/15 from 21/18
1st number: 1 3/18, 2nd number: 3 4/15
21/18 - 49/15 is -21/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 15 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Likewise, for the 2nd fraction, since 15 × 6 = 90,
49/15 = 49 × 6/15 × 6 = 294/90 - Subtract the two like fractions:
105/90 - 294/90 = 105 - 294/90 = -189/90 - After reducing the fraction, the answer is -21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18-49/15 21/18-98/15 21/36-49/15 21/18-49/30 63/18-49/15 21/54-49/15 21/18-49/45 21/90-49/15 21/18-49/75