Subtract 20/21 from 35/12
1st number: 2 11/12, 2nd number: 20/21
35/12 - 20/21 is 55/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
35/12 = 35 × 7/12 × 7 = 245/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Subtract the two like fractions:
245/84 - 80/84 = 245 - 80/84 = 165/84 - After reducing the fraction, the answer is 55/28
- In mixed form: 127/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/12-20/21 35/12-40/21 35/24-20/21 35/12-20/42 35/12-60/21 35/36-20/21 35/12-20/63 35/60-20/21 35/84-20/21