Subtract 45/12 from 18/15
1st number: 1 3/15, 2nd number: 3 9/12
18/15 - 45/12 is -51/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
18/15 = 18 × 4/15 × 4 = 72/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
45/12 = 45 × 5/12 × 5 = 225/60 - Subtract the two like fractions:
72/60 - 225/60 = 72 - 225/60 = -153/60 - After reducing the fraction, the answer is -51/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15-45/12 18/15-90/12 18/30-45/12 18/15-45/24 54/15-45/12 18/45-45/12 18/15-45/36 90/15-45/12 18/75-45/12 18/15-45/60 18/15-45/84