Subtract 90/40 from 27/15
1st number: 1 12/15, 2nd number: 2 10/40
27/15 - 90/40 is -9/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
27/15 = 27 × 8/15 × 8 = 216/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
90/40 = 90 × 3/40 × 3 = 270/120 - Subtract the two like fractions:
216/120 - 270/120 = 216 - 270/120 = -54/120 - After reducing the fraction, the answer is -9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/15-90/40 27/30-90/40 27/15-90/80 81/15-90/40 27/45-90/40 27/75-90/40