Subtract 18/20 from 18/4
1st number: 4 2/4, 2nd number: 18/20
18/4 - 18/20 is 18/5.
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,
18/4 = 18 × 5/4 × 5 = 90/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
18/20 = 18 × 1/20 × 1 = 18/20 - Subtract the two like fractions:
90/20 - 18/20 = 90 - 18/20 = 72/20 - After reducing the fraction, the answer is 18/5
- In mixed form: 33/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/4-18/20 18/4-36/20 18/8-18/20 18/4-18/40 54/4-18/20 18/4-54/20 18/12-18/20 18/4-18/60 90/4-18/20 18/4-90/20 18/20-18/20 18/28-18/20