Subtract 42/12 from 35/21
1st number: 1 14/21, 2nd number: 3 6/12
35/21 - 42/12 is -11/6.
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,
35/21 = 35 × 4/21 × 4 = 140/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
42/12 = 42 × 7/12 × 7 = 294/84 - Subtract the two like fractions:
140/84 - 294/84 = 140 - 294/84 = -154/84 - After reducing the fraction, the answer is -11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-42/12 35/21-84/12 35/42-42/12 35/21-42/24 35/63-42/12 35/21-42/36 35/21-42/60 35/21-42/84