Subtract 35/12 from 20/21
1st number: 20/21, 2nd number: 2 11/12
20/21 - 35/12 is -55/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
35/12 = 35 × 7/12 × 7 = 245/84 - Subtract the two like fractions:
80/84 - 245/84 = 80 - 245/84 = -165/84 - After reducing the fraction, the answer is -55/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-35/12 20/21-70/12 20/42-35/12 20/21-35/24 60/21-35/12 20/63-35/12 20/21-35/36 20/21-35/60 20/21-35/84