Subtract 54/45 from 20/12
1st number: 1 8/12, 2nd number: 1 9/45
20/12 - 54/45 is 7/15.
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,
20/12 = 20 × 15/12 × 15 = 300/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
54/45 = 54 × 4/45 × 4 = 216/180 - Subtract the two like fractions:
300/180 - 216/180 = 300 - 216/180 = 84/180 - After reducing the fraction, the answer is 7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12-54/45 20/24-54/45 20/12-54/90 60/12-54/45 20/36-54/45 20/60-54/45 20/84-54/45