Subtract 21/80 from 21/75
21/75 - 21/80 is 7/400.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 80 is 1200
Next, find the equivalent fraction of both fractional numbers with denominator 1200 - For the 1st fraction, since 75 × 16 = 1200,
21/75 = 21 × 16/75 × 16 = 336/1200 - Likewise, for the 2nd fraction, since 80 × 15 = 1200,
21/80 = 21 × 15/80 × 15 = 315/1200 - Subtract the two like fractions:
336/1200 - 315/1200 = 336 - 315/1200 = 21/1200 - After reducing the fraction, the answer is 7/400
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75-21/80 21/75-42/80 63/75-21/80 21/75-63/80