Subtract 21/8 from 28/63
1st number: 28/63, 2nd number: 2 5/8
28/63 - 21/8 is -157/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 8 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 63 × 8 = 504,
28/63 = 28 × 8/63 × 8 = 224/504 - Likewise, for the 2nd fraction, since 8 × 63 = 504,
21/8 = 21 × 63/8 × 63 = 1323/504 - Subtract the two like fractions:
224/504 - 1323/504 = 224 - 1323/504 = -1099/504 - After reducing the fraction, the answer is -157/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/63-21/8 28/63-42/8 28/63-21/16 84/63-21/8 28/63-63/8 28/63-21/24 28/63-21/40 28/63-21/56