Subtract 35/21 from 21/12
1st number: 1 9/12, 2nd number: 1 14/21
21/12 - 35/21 is 1/12.
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,
21/12 = 21 × 7/12 × 7 = 147/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
35/21 = 35 × 4/21 × 4 = 140/84 - Subtract the two like fractions:
147/84 - 140/84 = 147 - 140/84 = 7/84 - After reducing the fraction, the answer is 1/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-35/21 21/12-70/21 21/24-35/21 21/12-35/42 63/12-35/21 21/36-35/21 21/12-35/63 21/60-35/21 21/84-35/21