Add 18/5 and 4/21
1st number: 3 3/5, 2nd number: 4/21
18/5 + 4/21 is 398/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
18/5 = 18 × 21/5 × 21 = 378/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
4/21 = 4 × 5/21 × 5 = 20/105 - Add the two like fractions:
378/105 + 20/105 = 378 + 20/105 = 398/105 - So, 18/5 + 4/21 = 398/105
In mixed form: 383/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5+4/21 18/5+8/21 18/10+4/21 18/5+4/42 54/5+4/21 18/5+12/21 18/15+4/21 18/5+4/63 90/5+4/21 18/5+20/21 18/25+4/21 18/5+28/21 18/35+4/21