Add 18/84 and 30/20
1st number: 18/84, 2nd number: 1 10/20
18/84 + 30/20 is 12/7.
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,
30/20 = 30 × 21/20 × 21 = 630/420 - Add the two like fractions:
90/420 + 630/420 = 90 + 630/420 = 720/420 - 720/420 simplified gives 12/7
- So, 18/84 + 30/20 = 12/7
In mixed form: 15/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84+30/20 18/84+60/20 18/84+30/40 54/84+30/20 18/84+90/20 18/84+30/60 90/84+30/20