Subtract 81/4 from 42/50
1st number: 42/50, 2nd number: 20 1/4
42/50 - 81/4 is -1941/100.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 4 is 100
Next, find the equivalent fraction of both fractional numbers with denominator 100 - For the 1st fraction, since 50 × 2 = 100,
42/50 = 42 × 2/50 × 2 = 84/100 - Likewise, for the 2nd fraction, since 4 × 25 = 100,
81/4 = 81 × 25/4 × 25 = 2025/100 - Subtract the two like fractions:
84/100 - 2025/100 = 84 - 2025/100 = -1941/100
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/50-81/4 42/50-81/8 42/50-81/12 42/50-81/20 42/50-81/28