Subtract 90/32 from 21/28
1st number: 21/28, 2nd number: 2 26/32
21/28 - 90/32 is -33/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 32 is 224
Next, find the equivalent fraction of both fractional numbers with denominator 224 - For the 1st fraction, since 28 × 8 = 224,
21/28 = 21 × 8/28 × 8 = 168/224 - Likewise, for the 2nd fraction, since 32 × 7 = 224,
90/32 = 90 × 7/32 × 7 = 630/224 - Subtract the two like fractions:
168/224 - 630/224 = 168 - 630/224 = -462/224 - After reducing the fraction, the answer is -33/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-90/32 21/56-90/32 21/28-90/64 63/28-90/32 21/84-90/32 21/28-90/96