Subtract 20/49 from 30/21
1st number: 1 9/21, 2nd number: 20/49
30/21 - 20/49 is 50/49.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 49 is 147
Next, find the equivalent fraction of both fractional numbers with denominator 147 - For the 1st fraction, since 21 × 7 = 147,
30/21 = 30 × 7/21 × 7 = 210/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
20/49 = 20 × 3/49 × 3 = 60/147 - Subtract the two like fractions:
210/147 - 60/147 = 210 - 60/147 = 150/147 - After reducing the fraction, the answer is 50/49
- In mixed form: 11/49
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-20/49 30/21-40/49 30/42-20/49 30/21-20/98 90/21-20/49 30/21-60/49 30/63-20/49