Subtract 7/45 from 45/12
1st number: 3 9/12, 2nd number: 7/45
45/12 - 7/45 is 647/180.
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,
45/12 = 45 × 15/12 × 15 = 675/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
7/45 = 7 × 4/45 × 4 = 28/180 - Subtract the two like fractions:
675/180 - 28/180 = 675 - 28/180 = 647/180 - In mixed form: 3107/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-7/45 45/12-14/45 45/24-7/45 45/12-7/90 45/12-21/45 45/36-7/45 45/12-35/45 45/60-7/45 45/12-49/45 45/84-7/45