Subtract 40/42 from 45/50
45/50 - 40/42 is -11/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 42 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 50 × 21 = 1050,
45/50 = 45 × 21/50 × 21 = 945/1050 - Likewise, for the 2nd fraction, since 42 × 25 = 1050,
40/42 = 40 × 25/42 × 25 = 1000/1050 - Subtract the two like fractions:
945/1050 - 1000/1050 = 945 - 1000/1050 = -55/1050 - After reducing the fraction, the answer is -11/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/50-40/42 45/50-80/42 45/50-40/84