Subtract 45/18 from 12/15
1st number: 12/15, 2nd number: 2 9/18
12/15 - 45/18 is -17/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
12/15 = 12 × 6/15 × 6 = 72/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
45/18 = 45 × 5/18 × 5 = 225/90 - Subtract the two like fractions:
72/90 - 225/90 = 72 - 225/90 = -153/90 - After reducing the fraction, the answer is -17/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-45/18 12/15-90/18 12/30-45/18 12/15-45/36 36/15-45/18 12/45-45/18 12/15-45/54 60/15-45/18 12/75-45/18 12/15-45/90 84/15-45/18