Subtract 21/40 from 32/63
32/63 - 21/40 is -43/2520.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 40 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 63 × 40 = 2520,
32/63 = 32 × 40/63 × 40 = 1280/2520 - Likewise, for the 2nd fraction, since 40 × 63 = 2520,
21/40 = 21 × 63/40 × 63 = 1323/2520 - Subtract the two like fractions:
1280/2520 - 1323/2520 = 1280 - 1323/2520 = -43/2520
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 64/63-21/40 32/63-42/40 32/63-21/80 96/63-21/40 32/63-63/40