Subtract 1/9 from 21/49, Solve 21/49

Subtract 1/9 from 21/49

21/49 - 1/9 is 20/63.

Find the least common denominator or LCM of the two denominators:
LCM of 49 and 9 is 441

Next, find the equivalent fraction of both fractional numbers with denominator 441
For the 1st fraction, since 49 × 9 = 441,
21/49 = 21 × 9/49 × 9 = 189/441
Likewise, for the 2nd fraction, since 9 × 49 = 441,
1/9 = 1 × 49/9 × 49 = 49/441
Subtract the two like fractions:
189/441 - 49/441 = 189 - 49/441 = 140/441
After reducing the fraction, the answer is 20/63

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad