Subtract 20/18 from 30/28
1st number: 1 2/28, 2nd number: 1 2/18
30/28 - 20/18 is -5/126.
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,
30/28 = 30 × 9/28 × 9 = 270/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
20/18 = 20 × 14/18 × 14 = 280/252 - Subtract the two like fractions:
270/252 - 280/252 = 270 - 280/252 = -10/252 - After reducing the fraction, the answer is -5/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28-20/18 30/28-40/18 30/56-20/18 30/28-20/36 90/28-20/18 30/28-60/18 30/84-20/18 30/28-20/54 30/28-20/90