Subtract 49/21 from 7/20
1st number: 7/20, 2nd number: 2 7/21
7/20 - 49/21 is -119/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
49/21 = 49 × 20/21 × 20 = 980/420 - Subtract the two like fractions:
147/420 - 980/420 = 147 - 980/420 = -833/420 - After reducing the fraction, the answer is -119/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20-49/21 7/20-98/21 7/40-49/21 7/20-49/42 21/20-49/21 7/60-49/21 7/20-49/63 35/20-49/21 49/20-49/21