Subtract 21/40 from 80/63
1st number: 1 17/63, 2nd number: 21/40
80/63 - 21/40 is 1877/2520.
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,
80/63 = 80 × 40/63 × 40 = 3200/2520 - Likewise, for the 2nd fraction, since 40 × 63 = 2520,
21/40 = 21 × 63/40 × 63 = 1323/2520 - Subtract the two like fractions:
3200/2520 - 1323/2520 = 3200 - 1323/2520 = 1877/2520
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/63-42/40 80/63-21/80 80/63-63/40