Add 18/5 and 10/21
1st number: 3 3/5, 2nd number: 10/21
18/5 + 10/21 is 428/105.
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,
10/21 = 10 × 5/21 × 5 = 50/105 - Add the two like fractions:
378/105 + 50/105 = 378 + 50/105 = 428/105 - So, 18/5 + 10/21 = 428/105
In mixed form: 48/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5+10/21 18/5+20/21 18/10+10/21 18/5+10/42 54/5+10/21 18/5+30/21 18/15+10/21 18/5+10/63 90/5+10/21 18/5+50/21 18/25+10/21 18/5+70/21 18/35+10/21