Subtract 48/18 from 42/80
1st number: 42/80, 2nd number: 2 12/18
42/80 - 48/18 is -257/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Likewise, for the 2nd fraction, since 18 × 40 = 720,
48/18 = 48 × 40/18 × 40 = 1920/720 - Subtract the two like fractions:
378/720 - 1920/720 = 378 - 1920/720 = -1542/720 - After reducing the fraction, the answer is -257/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80-48/18 42/80-96/18 42/80-48/36 42/80-48/54 42/80-48/90