Subtract 28/40 from 3/15
3/15 - 28/40 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
3/15 = 3 × 8/15 × 8 = 24/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
28/40 = 28 × 3/40 × 3 = 84/120 - Subtract the two like fractions:
24/120 - 84/120 = 24 - 84/120 = -60/120 - After reducing the fraction, the answer is -1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/15-28/40 3/15-56/40 3/30-28/40 3/15-28/80 9/15-28/40 3/15-84/40 3/45-28/40 3/75-28/40 21/15-28/40