Subtract 27/10 from 21/27
1st number: 21/27, 2nd number: 2 7/10
21/27 - 27/10 is -173/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 10 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 27 × 10 = 270,
21/27 = 21 × 10/27 × 10 = 210/270 - Likewise, for the 2nd fraction, since 10 × 27 = 270,
27/10 = 27 × 27/10 × 27 = 729/270 - Subtract the two like fractions:
210/270 - 729/270 = 210 - 729/270 = -519/270 - After reducing the fraction, the answer is -173/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27-27/10 21/27-54/10 21/54-27/10 21/27-27/20 63/27-27/10 21/27-81/10 21/81-27/10 21/27-27/30 21/27-27/50 21/27-27/70