Subtract 21/50 from 7/80
7/80 - 21/50 is -133/400.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 50 is 400
Next, find the equivalent fraction of both fractional numbers with denominator 400 - For the 1st fraction, since 80 × 5 = 400,
7/80 = 7 × 5/80 × 5 = 35/400 - Likewise, for the 2nd fraction, since 50 × 8 = 400,
21/50 = 21 × 8/50 × 8 = 168/400 - Subtract the two like fractions:
35/400 - 168/400 = 35 - 168/400 = -133/400
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/80-21/50 7/80-42/50 21/80-21/50 7/80-63/50 35/80-21/50 49/80-21/50