Subtract 25/30 from 30/40
30/40 - 25/30 is -1/12.
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,
30/40 = 30 × 3/40 × 3 = 90/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
25/30 = 25 × 4/30 × 4 = 100/120 - Subtract the two like fractions:
90/120 - 100/120 = 90 - 100/120 = -10/120 - After reducing the fraction, the answer is -1/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/40-25/30 30/40-50/30 30/80-25/30 30/40-25/60 90/40-25/30 30/40-75/30 30/40-25/90