Subtract 14/21 from 7/20
7/20 - 14/21 is -19/60.
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,
14/21 = 14 × 20/21 × 20 = 280/420 - Subtract the two like fractions:
147/420 - 280/420 = 147 - 280/420 = -133/420 - After reducing the fraction, the answer is -19/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20-14/21 7/20-28/21 7/40-14/21 7/20-14/42 21/20-14/21 7/20-42/21 7/60-14/21 7/20-14/63 35/20-14/21 7/20-70/21 49/20-14/21 7/20-98/21