Subtract 27/10 from 21/70
1st number: 21/70, 2nd number: 2 7/10
21/70 - 27/10 is -12/5.
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,
21/70 = 21 × 1/70 × 1 = 21/70 - Likewise, for the 2nd fraction, since 10 × 7 = 70,
27/10 = 27 × 7/10 × 7 = 189/70 - Subtract the two like fractions:
21/70 - 189/70 = 21 - 189/70 = -168/70 - After reducing the fraction, the answer is -12/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-27/10 21/70-54/10 21/70-27/20 63/70-27/10 21/70-81/10 21/70-27/30 21/70-27/50 21/70-27/70