Add 18/84 and 75/20
1st number: 18/84, 2nd number: 3 15/20
18/84 + 75/20 is 111/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
18/84 = 18 × 5/84 × 5 = 90/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
75/20 = 75 × 21/20 × 21 = 1575/420 - Add the two like fractions:
90/420 + 1575/420 = 90 + 1575/420 = 1665/420 - 1665/420 simplified gives 111/28
- So, 18/84 + 75/20 = 111/28
In mixed form: 327/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84+75/20 18/84+75/40 54/84+75/20 18/84+75/60 90/84+75/20