Add 20/21 and 18/4
1st number: 20/21, 2nd number: 4 2/4
20/21 + 18/4 is 229/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
18/4 = 18 × 21/4 × 21 = 378/84 - Add the two like fractions:
80/84 + 378/84 = 80 + 378/84 = 458/84 - 458/84 simplified gives 229/42
- So, 20/21 + 18/4 = 229/42
In mixed form: 519/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+18/4 20/21+36/4 20/42+18/4 20/21+18/8 60/21+18/4 20/21+54/4 20/63+18/4 20/21+18/12 20/21+90/4 20/21+18/20 20/21+18/28