Subtract 21/10 from 20/70
1st number: 20/70, 2nd number: 2 1/10
20/70 - 21/10 is -127/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 10 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 70 × 1 = 70,
20/70 = 20 × 1/70 × 1 = 20/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
21/10 = 21 × 7/10 × 7 = 147/70 - Subtract the two like fractions:
20/70 - 147/70 = 20 - 147/70 = -127/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70-21/10 20/70-42/10 20/70-21/20 60/70-21/10 20/70-63/10 20/70-21/30 20/70-21/50 20/70-21/70