Subtract 70/35 from 21/12
1st number: 1 9/12, 2nd number: 2 0/35
21/12 - 70/35 is -1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 35 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 12 × 35 = 420,
21/12 = 21 × 35/12 × 35 = 735/420 - Likewise, for the 2nd fraction, since 35 × 12 = 420,
70/35 = 70 × 12/35 × 12 = 840/420 - Subtract the two like fractions:
735/420 - 840/420 = 735 - 840/420 = -105/420 - After reducing the fraction, the answer is -1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-70/35 21/24-70/35 63/12-70/35 21/36-70/35 21/60-70/35 21/84-70/35