Subtract 42/30 from 5/28
1st number: 5/28, 2nd number: 1 12/30
5/28 - 42/30 is -171/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
5/28 = 5 × 15/28 × 15 = 75/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
42/30 = 42 × 14/30 × 14 = 588/420 - Subtract the two like fractions:
75/420 - 588/420 = 75 - 588/420 = -513/420 - After reducing the fraction, the answer is -171/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/28-42/30 5/28-84/30 5/56-42/30 5/28-42/60 15/28-42/30 5/84-42/30 5/28-42/90 25/28-42/30 35/28-42/30