Subtract 35/28 from 40/42
1st number: 40/42, 2nd number: 1 7/28
40/42 - 35/28 is -25/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
40/42 = 40 × 2/42 × 2 = 80/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
35/28 = 35 × 3/28 × 3 = 105/84 - Subtract the two like fractions:
80/84 - 105/84 = 80 - 105/84 = -25/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42-35/28 40/42-70/28 40/84-35/28 40/42-35/56 40/42-35/84