Subtract 21/35 from 10/20
10/20 - 21/35 is -1/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 35 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
10/20 = 10 × 7/20 × 7 = 70/140 - Likewise, for the 2nd fraction, since 35 × 4 = 140,
21/35 = 21 × 4/35 × 4 = 84/140 - Subtract the two like fractions:
70/140 - 84/140 = 70 - 84/140 = -14/140 - After reducing the fraction, the answer is -1/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-42/35 10/40-21/35 10/20-21/70 30/20-21/35 10/20-63/35 10/60-21/35 50/20-21/35 70/20-21/35