Add 10/5 and 15/21
1st number: 2 0/5, 2nd number: 15/21
10/5 + 15/21 is 19/7.
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,
10/5 = 10 × 21/5 × 21 = 210/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
15/21 = 15 × 5/21 × 5 = 75/105 - Add the two like fractions:
210/105 + 75/105 = 210 + 75/105 = 285/105 - 285/105 simplified gives 19/7
- So, 10/5 + 15/21 = 19/7
In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/5+15/21 10/5+30/21 10/5+15/42 30/5+15/21 10/5+45/21 10/15+15/21 10/5+15/63 50/5+15/21 10/5+75/21 10/25+15/21 70/5+15/21 10/35+15/21