Subtract 8/20 from 12/18
12/18 - 8/20 is 4/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
12/18 = 12 × 10/18 × 10 = 120/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
8/20 = 8 × 9/20 × 9 = 72/180 - Subtract the two like fractions:
120/180 - 72/180 = 120 - 72/180 = 48/180 - After reducing the fraction, the answer is 4/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/18-8/20 12/18-16/20 12/36-8/20 12/18-8/40 36/18-8/20 12/18-24/20 12/54-8/20 12/18-8/60 60/18-8/20 12/18-40/20 12/90-8/20 84/18-8/20 12/18-56/20