Subtract 40/42 from 10/28
10/28 - 40/42 is -25/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
10/28 = 10 × 3/28 × 3 = 30/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
40/42 = 40 × 2/42 × 2 = 80/84 - Subtract the two like fractions:
30/84 - 80/84 = 30 - 80/84 = -50/84 - After reducing the fraction, the answer is -25/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/28-40/42 10/28-80/42 10/56-40/42 10/28-40/84 30/28-40/42 10/84-40/42 50/28-40/42 70/28-40/42