Subtract 72/21 from 27/10
1st number: 2 7/10, 2nd number: 3 9/21
27/10 - 72/21 is -51/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
27/10 = 27 × 21/10 × 21 = 567/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
72/21 = 72 × 10/21 × 10 = 720/210 - Subtract the two like fractions:
567/210 - 720/210 = 567 - 720/210 = -153/210 - After reducing the fraction, the answer is -51/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/10-72/21 27/20-72/21 27/10-72/42 81/10-72/21 27/30-72/21 27/10-72/63 27/50-72/21 27/70-72/21