Subtract 9/80 from 21/36
21/36 - 9/80 is 113/240.
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,
21/36 = 21 × 20/36 × 20 = 420/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
9/80 = 9 × 9/80 × 9 = 81/720 - Subtract the two like fractions:
420/720 - 81/720 = 420 - 81/720 = 339/720 - After reducing the fraction, the answer is 113/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36-9/80 21/36-18/80 21/72-9/80 63/36-9/80 21/36-27/80 21/36-45/80 21/36-63/80