Subtract 2/9 from 20/21
20/21 - 2/9 is 46/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 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 9 × 7 = 63,
2/9 = 2 × 7/9 × 7 = 14/63 - Subtract the two like fractions:
60/63 - 14/63 = 60 - 14/63 = 46/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-2/9 20/21-4/9 20/42-2/9 20/21-2/18 60/21-2/9 20/21-6/9 20/63-2/9 20/21-2/27 20/21-10/9 20/21-2/45 20/21-14/9 20/21-2/63