Subtract 21/40 from 18/14
1st number: 1 4/14, 2nd number: 21/40
18/14 - 21/40 is 213/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 14 × 20 = 280,
18/14 = 18 × 20/14 × 20 = 360/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
21/40 = 21 × 7/40 × 7 = 147/280 - Subtract the two like fractions:
360/280 - 147/280 = 360 - 147/280 = 213/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/14-21/40 18/14-42/40 18/28-21/40 18/14-21/80 54/14-21/40 18/14-63/40 18/42-21/40 90/14-21/40 18/70-21/40 18/98-21/40