Subtract 12/20 from 4/18
4/18 - 12/20 is -17/45.
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,
4/18 = 4 × 10/18 × 10 = 40/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
12/20 = 12 × 9/20 × 9 = 108/180 - Subtract the two like fractions:
40/180 - 108/180 = 40 - 108/180 = -68/180 - After reducing the fraction, the answer is -17/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/18-12/20 4/18-24/20 4/36-12/20 4/18-12/40 12/18-12/20 4/18-36/20 4/54-12/20 4/18-12/60 20/18-12/20 4/18-60/20 4/90-12/20 28/18-12/20 4/18-84/20