Subtract 30/40 from 12/24
12/24 - 30/40 is -1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
12/24 = 12 × 5/24 × 5 = 60/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
30/40 = 30 × 3/40 × 3 = 90/120 - Subtract the two like fractions:
60/120 - 90/120 = 60 - 90/120 = -30/120 - After reducing the fraction, the answer is -1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/24-60/40 12/48-30/40 12/24-30/80 36/24-30/40 12/24-90/40 12/72-30/40 60/24-30/40 84/24-30/40