Subtract 25/30 from 28/40
28/40 - 25/30 is -2/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
28/40 = 28 × 3/40 × 3 = 84/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
25/30 = 25 × 4/30 × 4 = 100/120 - Subtract the two like fractions:
84/120 - 100/120 = 84 - 100/120 = -16/120 - After reducing the fraction, the answer is -2/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40-25/30 28/40-50/30 28/80-25/30 28/40-25/60 84/40-25/30 28/40-75/30 28/40-25/90