Subtract 42/50 from 49/80
49/80 - 42/50 is -91/400.
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,
49/80 = 49 × 5/80 × 5 = 245/400 - Likewise, for the 2nd fraction, since 50 × 8 = 400,
42/50 = 42 × 8/50 × 8 = 336/400 - Subtract the two like fractions:
245/400 - 336/400 = 245 - 336/400 = -91/400
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/80-42/50 49/80-84/50