Add 18/21 and 84/20
1st number: 18/21, 2nd number: 4 4/20
18/21 + 84/20 is 177/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
18/21 = 18 × 20/21 × 20 = 360/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
84/20 = 84 × 21/20 × 21 = 1764/420 - Add the two like fractions:
360/420 + 1764/420 = 360 + 1764/420 = 2124/420 - 2124/420 simplified gives 177/35
- So, 18/21 + 84/20 = 177/35
In mixed form: 52/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+84/20 18/42+84/20 18/21+84/40 54/21+84/20 18/63+84/20 18/21+84/60 90/21+84/20