Subtract 90/49 from 21/30
1st number: 21/30, 2nd number: 1 41/49
21/30 - 90/49 is -557/490.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 49 is 1470
Next, find the equivalent fraction of both fractional numbers with denominator 1470 - For the 1st fraction, since 30 × 49 = 1470,
21/30 = 21 × 49/30 × 49 = 1029/1470 - Likewise, for the 2nd fraction, since 49 × 30 = 1470,
90/49 = 90 × 30/49 × 30 = 2700/1470 - Subtract the two like fractions:
1029/1470 - 2700/1470 = 1029 - 2700/1470 = -1671/1470 - After reducing the fraction, the answer is -557/490
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-90/49 21/60-90/49 21/30-90/98 63/30-90/49 21/90-90/49