Subtract 4/36 from 42/80
42/80 - 4/36 is 149/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 36 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 36 × 20 = 720,
4/36 = 4 × 20/36 × 20 = 80/720 - Subtract the two like fractions:
378/720 - 80/720 = 378 - 80/720 = 298/720 - After reducing the fraction, the answer is 149/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80-4/36 42/80-8/36 42/80-4/72 42/80-12/36 42/80-20/36 42/80-28/36