Subtract 42/80 from 15/25
15/25 - 42/80 is 3/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 80 is 400
Next, find the equivalent fraction of both fractional numbers with denominator 400 - For the 1st fraction, since 25 × 16 = 400,
15/25 = 15 × 16/25 × 16 = 240/400 - Likewise, for the 2nd fraction, since 80 × 5 = 400,
42/80 = 42 × 5/80 × 5 = 210/400 - Subtract the two like fractions:
240/400 - 210/400 = 240 - 210/400 = 30/400 - After reducing the fraction, the answer is 3/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/25-42/80 15/25-84/80 15/50-42/80 45/25-42/80 15/75-42/80 75/25-42/80