Subtract 7/90 from 21/56
21/56 - 7/90 is 107/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 90 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 56 × 45 = 2520,
21/56 = 21 × 45/56 × 45 = 945/2520 - Likewise, for the 2nd fraction, since 90 × 28 = 2520,
7/90 = 7 × 28/90 × 28 = 196/2520 - Subtract the two like fractions:
945/2520 - 196/2520 = 945 - 196/2520 = 749/2520 - After reducing the fraction, the answer is 107/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-7/90 21/56-14/90 63/56-7/90 21/56-21/90 21/56-35/90 21/56-49/90