Subtract 28/20 from 24/42
1st number: 24/42, 2nd number: 1 8/20
24/42 - 28/20 is -29/35.
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,
24/42 = 24 × 10/42 × 10 = 240/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
28/20 = 28 × 21/20 × 21 = 588/420 - Subtract the two like fractions:
240/420 - 588/420 = 240 - 588/420 = -348/420 - After reducing the fraction, the answer is -29/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/42-28/20 24/42-56/20 24/84-28/20 24/42-28/40 72/42-28/20 24/42-84/20 24/42-28/60