Subtract 30/50 from 10/80
10/80 - 30/50 is -19/40.
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,
10/80 = 10 × 5/80 × 5 = 50/400 - Likewise, for the 2nd fraction, since 50 × 8 = 400,
30/50 = 30 × 8/50 × 8 = 240/400 - Subtract the two like fractions:
50/400 - 240/400 = 50 - 240/400 = -190/400 - After reducing the fraction, the answer is -19/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/80-30/50 10/80-60/50 30/80-30/50 10/80-90/50 50/80-30/50 70/80-30/50