Subtract 18/84 from 5/20
5/20 - 18/84 is 1/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
18/84 = 18 × 5/84 × 5 = 90/420 - Subtract the two like fractions:
105/420 - 90/420 = 105 - 90/420 = 15/420 - After reducing the fraction, the answer is 1/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-18/84 5/20-36/84 5/40-18/84 15/20-18/84 5/20-54/84 5/60-18/84 25/20-18/84 5/20-90/84 35/20-18/84