Subtract 21/70 from 10/20
10/20 - 21/70 is 1/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 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 70 × 2 = 140,
21/70 = 21 × 2/70 × 2 = 42/140 - Subtract the two like fractions:
70/140 - 42/140 = 70 - 42/140 = 28/140 - After reducing the fraction, the answer is 1/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-42/70 10/40-21/70 30/20-21/70 10/20-63/70 10/60-21/70 50/20-21/70 70/20-21/70