Subtract 14/40 from 4/21
4/21 - 14/40 is -67/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
4/21 = 4 × 40/21 × 40 = 160/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
14/40 = 14 × 21/40 × 21 = 294/840 - Subtract the two like fractions:
160/840 - 294/840 = 160 - 294/840 = -134/840 - After reducing the fraction, the answer is -67/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-14/40 4/21-28/40 4/42-14/40 4/21-14/80 12/21-14/40 4/21-42/40 4/63-14/40 20/21-14/40 4/21-70/40 28/21-14/40 4/21-98/40