Subtract 20/18 from 18/28
1st number: 18/28, 2nd number: 1 2/18
18/28 - 20/18 is -59/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 18 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
18/28 = 18 × 9/28 × 9 = 162/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
20/18 = 20 × 14/18 × 14 = 280/252 - Subtract the two like fractions:
162/252 - 280/252 = 162 - 280/252 = -118/252 - After reducing the fraction, the answer is -59/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28-20/18 18/28-40/18 18/56-20/18 18/28-20/36 54/28-20/18 18/28-60/18 18/84-20/18 18/28-20/54 90/28-20/18 18/28-20/90