Subtract 18/20 from 81/4
1st number: 20 1/4, 2nd number: 18/20
81/4 - 18/20 is 387/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
81/4 = 81 × 5/4 × 5 = 405/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
18/20 = 18 × 1/20 × 1 = 18/20 - Subtract the two like fractions:
405/20 - 18/20 = 405 - 18/20 = 387/20 - In mixed form: 197/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/4-36/20 81/8-18/20 81/4-18/40 81/4-54/20 81/12-18/20 81/4-18/60 81/4-90/20 81/20-18/20 81/28-18/20