Subtract 15/21 from 27/20
1st number: 1 7/20, 2nd number: 15/21
27/20 - 15/21 is 89/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
27/20 = 27 × 21/20 × 21 = 567/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
15/21 = 15 × 20/21 × 20 = 300/420 - Subtract the two like fractions:
567/420 - 300/420 = 567 - 300/420 = 267/420 - After reducing the fraction, the answer is 89/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/20-15/21 27/20-30/21 27/40-15/21 27/20-15/42 81/20-15/21 27/20-45/21 27/60-15/21 27/20-15/63 27/20-75/21