Subtract 27/15 from 30/20
1st number: 1 10/20, 2nd number: 1 12/15
30/20 - 27/15 is -3/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
30/20 = 30 × 3/20 × 3 = 90/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
27/15 = 27 × 4/15 × 4 = 108/60 - Subtract the two like fractions:
90/60 - 108/60 = 90 - 108/60 = -18/60 - After reducing the fraction, the answer is -3/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/20-27/15 30/20-54/15 30/40-27/15 30/20-27/30 90/20-27/15 30/20-81/15 30/60-27/15 30/20-27/45 30/20-27/75