Subtract 20/45 from 45/12
1st number: 3 9/12, 2nd number: 20/45
45/12 - 20/45 is 119/36.
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,
20/45 = 20 × 4/45 × 4 = 80/180 - Subtract the two like fractions:
675/180 - 80/180 = 675 - 80/180 = 595/180 - After reducing the fraction, the answer is 119/36
- In mixed form: 311/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-20/45 45/12-40/45 45/24-20/45 45/12-20/90 45/12-60/45 45/36-20/45 45/60-20/45 45/84-20/45