Subtract 45/90 from 15/60
15/60 - 45/90 is -1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 60 × 3 = 180,
15/60 = 15 × 3/60 × 3 = 45/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
45/90 = 45 × 2/90 × 2 = 90/180 - Subtract the two like fractions:
45/180 - 90/180 = 45 - 90/180 = -45/180 - After reducing the fraction, the answer is -1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/60-45/90 45/60-45/90 75/60-45/90