Subtract 40/50 from 15/45
15/45 - 40/50 is -7/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 50 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 45 × 10 = 450,
15/45 = 15 × 10/45 × 10 = 150/450 - Likewise, for the 2nd fraction, since 50 × 9 = 450,
40/50 = 40 × 9/50 × 9 = 360/450 - Subtract the two like fractions:
150/450 - 360/450 = 150 - 360/450 = -210/450 - After reducing the fraction, the answer is -7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/45-40/50 15/45-80/50 15/90-40/50 75/45-40/50