Subtract 3/18 from 12/15
12/15 - 3/18 is 19/30.
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,
3/18 = 3 × 5/18 × 5 = 15/90 - Subtract the two like fractions:
72/90 - 15/90 = 72 - 15/90 = 57/90 - After reducing the fraction, the answer is 19/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-3/18 12/15-6/18 12/30-3/18 12/15-3/36 36/15-3/18 12/15-9/18 12/45-3/18 12/15-3/54 60/15-3/18 12/15-15/18 12/75-3/18 12/15-3/90 84/15-3/18 12/15-21/18