Subtract 18/3 from 20/40
1st number: 20/40, 2nd number: 6 0/3
20/40 - 18/3 is -11/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 3 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
20/40 = 20 × 3/40 × 3 = 60/120 - Likewise, for the 2nd fraction, since 3 × 40 = 120,
18/3 = 18 × 40/3 × 40 = 720/120 - Subtract the two like fractions:
60/120 - 720/120 = 60 - 720/120 = -660/120 - After reducing the fraction, the answer is -11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-36/3 20/80-18/3 20/40-18/6 60/40-18/3 20/40-54/3 20/40-18/9 20/40-90/3 20/40-18/15 20/40-18/21