Subtract 12/15 from 7/45
7/45 - 12/15 is -29/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 15 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 45 × 1 = 45,
7/45 = 7 × 1/45 × 1 = 7/45 - Likewise, for the 2nd fraction, since 15 × 3 = 45,
12/15 = 12 × 3/15 × 3 = 36/45 - Subtract the two like fractions:
7/45 - 36/45 = 7 - 36/45 = -29/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/45-12/15 7/45-24/15 7/90-12/15 7/45-12/30 21/45-12/15 7/45-36/15 7/45-12/45 35/45-12/15 7/45-60/15 7/45-12/75 49/45-12/15 7/45-84/15