Subtract 21/10 from 27/70
1st number: 27/70, 2nd number: 2 1/10
27/70 - 21/10 is -12/7.
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,
27/70 = 27 × 1/70 × 1 = 27/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
21/10 = 21 × 7/10 × 7 = 147/70 - Subtract the two like fractions:
27/70 - 147/70 = 27 - 147/70 = -120/70 - After reducing the fraction, the answer is -12/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/70-21/10 27/70-42/10 27/70-21/20 81/70-21/10 27/70-63/10 27/70-21/30 27/70-21/50 27/70-21/70