Subtract 7/45 from 18/12
1st number: 1 6/12, 2nd number: 7/45
18/12 - 7/45 is 121/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
18/12 = 18 × 15/12 × 15 = 270/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
7/45 = 7 × 4/45 × 4 = 28/180 - Subtract the two like fractions:
270/180 - 28/180 = 270 - 28/180 = 242/180 - After reducing the fraction, the answer is 121/90
- In mixed form: 131/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-7/45 18/12-14/45 18/24-7/45 18/12-7/90 54/12-7/45 18/12-21/45 18/36-7/45 90/12-7/45 18/12-35/45 18/60-7/45 18/12-49/45 18/84-7/45