Subtract 10/63 from 20/21
20/21 - 10/63 is 50/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
20/21 = 20 × 3/21 × 3 = 60/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
10/63 = 10 × 1/63 × 1 = 10/63 - Subtract the two like fractions:
60/63 - 10/63 = 60 - 10/63 = 50/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-10/63 20/21-20/63 20/42-10/63 60/21-10/63 20/21-30/63 20/63-10/63 20/21-50/63 20/21-70/63