Subtract 90/50 from 28/40
1st number: 28/40, 2nd number: 1 40/50
28/40 - 90/50 is -11/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 50 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 40 × 5 = 200,
28/40 = 28 × 5/40 × 5 = 140/200 - Likewise, for the 2nd fraction, since 50 × 4 = 200,
90/50 = 90 × 4/50 × 4 = 360/200 - Subtract the two like fractions:
140/200 - 360/200 = 140 - 360/200 = -220/200 - After reducing the fraction, the answer is -11/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40-90/50 28/80-90/50 84/40-90/50