Subtract 90/50 from 30/80
1st number: 30/80, 2nd number: 1 40/50
30/80 - 90/50 is -57/40.
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,
30/80 = 30 × 5/80 × 5 = 150/400 - Likewise, for the 2nd fraction, since 50 × 8 = 400,
90/50 = 90 × 8/50 × 8 = 720/400 - Subtract the two like fractions:
150/400 - 720/400 = 150 - 720/400 = -570/400 - After reducing the fraction, the answer is -57/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80-90/50 90/80-90/50