Subtract 6/12 from 20/45
20/45 - 6/12 is -1/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
20/45 = 20 × 4/45 × 4 = 80/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
6/12 = 6 × 15/12 × 15 = 90/180 - Subtract the two like fractions:
80/180 - 90/180 = 80 - 90/180 = -10/180 - After reducing the fraction, the answer is -1/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/45-6/12 20/90-6/12 20/45-6/24 60/45-6/12 20/45-18/12 20/45-6/36 20/45-30/12 20/45-6/60 20/45-42/12 20/45-6/84