Subtract 90/72 from 4/50
1st number: 4/50, 2nd number: 1 18/72
4/50 - 90/72 is -117/100.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 72 is 1800
Next, find the equivalent fraction of both fractional numbers with denominator 1800 - For the 1st fraction, since 50 × 36 = 1800,
4/50 = 4 × 36/50 × 36 = 144/1800 - Likewise, for the 2nd fraction, since 72 × 25 = 1800,
90/72 = 90 × 25/72 × 25 = 2250/1800 - Subtract the two like fractions:
144/1800 - 2250/1800 = 144 - 2250/1800 = -2106/1800 - After reducing the fraction, the answer is -117/100
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/50-90/72 12/50-90/72 20/50-90/72 28/50-90/72