Subtract 14/20 from 7/42
7/42 - 14/20 is -8/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
7/42 = 7 × 10/42 × 10 = 70/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
14/20 = 14 × 21/20 × 21 = 294/420 - Subtract the two like fractions:
70/420 - 294/420 = 70 - 294/420 = -224/420 - After reducing the fraction, the answer is -8/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42-14/20 7/42-28/20 7/84-14/20 7/42-14/40 21/42-14/20 7/42-42/20 7/42-14/60 35/42-14/20 7/42-70/20 49/42-14/20 7/42-98/20