Subtract 49/60 from 18/21
18/21 - 49/60 is 17/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
18/21 = 18 × 20/21 × 20 = 360/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
49/60 = 49 × 7/60 × 7 = 343/420 - Subtract the two like fractions:
360/420 - 343/420 = 360 - 343/420 = 17/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-49/60 18/21-98/60 18/42-49/60 54/21-49/60 18/63-49/60 90/21-49/60