Subtract 25/42 from 28/20
1st number: 1 8/20, 2nd number: 25/42
28/20 - 25/42 is 169/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
28/20 = 28 × 21/20 × 21 = 588/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
25/42 = 25 × 10/42 × 10 = 250/420 - Subtract the two like fractions:
588/420 - 250/420 = 588 - 250/420 = 338/420 - After reducing the fraction, the answer is 169/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20-25/42 28/20-50/42 28/40-25/42 28/20-25/84 84/20-25/42 28/20-75/42 28/60-25/42