Subtract 35/20 from 28/42
1st number: 28/42, 2nd number: 1 15/20
28/42 - 35/20 is -13/12.
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,
28/42 = 28 × 10/42 × 10 = 280/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
35/20 = 35 × 21/20 × 21 = 735/420 - Subtract the two like fractions:
280/420 - 735/420 = 280 - 735/420 = -455/420 - After reducing the fraction, the answer is -13/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-35/20 28/42-70/20 28/84-35/20 28/42-35/40 84/42-35/20 28/42-35/60