Subtract 8/63 from 21/28
21/28 - 8/63 is 157/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 63 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
21/28 = 21 × 9/28 × 9 = 189/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
8/63 = 8 × 4/63 × 4 = 32/252 - Subtract the two like fractions:
189/252 - 32/252 = 189 - 32/252 = 157/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-8/63 21/28-16/63 21/56-8/63 63/28-8/63 21/28-24/63 21/84-8/63 21/28-40/63 21/28-56/63