Subtract 42/80 from 7/36
7/36 - 42/80 is -119/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 36 × 20 = 720,
7/36 = 7 × 20/36 × 20 = 140/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Subtract the two like fractions:
140/720 - 378/720 = 140 - 378/720 = -238/720 - After reducing the fraction, the answer is -119/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/36-42/80 7/36-84/80 7/72-42/80 21/36-42/80 35/36-42/80 49/36-42/80