Subtract 28/20 from 5/42
1st number: 5/42, 2nd number: 1 8/20
5/42 - 28/20 is -269/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
5/42 = 5 × 10/42 × 10 = 50/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
28/20 = 28 × 21/20 × 21 = 588/420 - Subtract the two like fractions:
50/420 - 588/420 = 50 - 588/420 = -538/420 - After reducing the fraction, the answer is -269/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/42-28/20 5/42-56/20 5/84-28/20 5/42-28/40 15/42-28/20 5/42-84/20 5/42-28/60 25/42-28/20 35/42-28/20