Subtract 90/20 from 72/25
1st number: 2 22/25, 2nd number: 4 10/20
72/25 - 90/20 is -81/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 20 is 100
Next, find the equivalent fraction of both fractional numbers with denominator 100 - For the 1st fraction, since 25 × 4 = 100,
72/25 = 72 × 4/25 × 4 = 288/100 - Likewise, for the 2nd fraction, since 20 × 5 = 100,
90/20 = 90 × 5/20 × 5 = 450/100 - Subtract the two like fractions:
288/100 - 450/100 = 288 - 450/100 = -162/100 - After reducing the fraction, the answer is -81/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/50-90/20 72/25-90/40 72/75-90/20 72/25-90/60