Subtract 21/63 from 20/40
20/40 - 21/63 is 1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 63 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 40 × 63 = 2520,
20/40 = 20 × 63/40 × 63 = 1260/2520 - Likewise, for the 2nd fraction, since 63 × 40 = 2520,
21/63 = 21 × 40/63 × 40 = 840/2520 - Subtract the two like fractions:
1260/2520 - 840/2520 = 1260 - 840/2520 = 420/2520 - After reducing the fraction, the answer is 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-42/63 20/80-21/63 60/40-21/63