Subtract 21/49 from 20/30
20/30 - 21/49 is 5/21.
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,
20/30 = 20 × 49/30 × 49 = 980/1470 - Likewise, for the 2nd fraction, since 49 × 30 = 1470,
21/49 = 21 × 30/49 × 30 = 630/1470 - Subtract the two like fractions:
980/1470 - 630/1470 = 980 - 630/1470 = 350/1470 - After reducing the fraction, the answer is 5/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-21/49 20/30-42/49 20/60-21/49 20/30-21/98 60/30-21/49 20/30-63/49 20/90-21/49