Subtract 18/50 from 7/80
7/80 - 18/50 is -109/400.
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,
18/50 = 18 × 8/50 × 8 = 144/400 - Subtract the two like fractions:
35/400 - 144/400 = 35 - 144/400 = -109/400
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/80-18/50 7/80-36/50 21/80-18/50 7/80-54/50 35/80-18/50 7/80-90/50 49/80-18/50