Add 9/21 and 15/7
1st number: 9/21, 2nd number: 2 1/7
9/21 + 15/7 is 18/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
9/21 = 9 × 1/21 × 1 = 9/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
15/7 = 15 × 3/7 × 3 = 45/21 - Add the two like fractions:
9/21 + 45/21 = 9 + 45/21 = 54/21 - 54/21 simplified gives 18/7
- So, 9/21 + 15/7 = 18/7
In mixed form: 24/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21+15/7 9/21+30/7 9/42+15/7 9/21+15/14 27/21+15/7 9/21+45/7 9/63+15/7 9/21+15/21 45/21+15/7 9/21+75/7 9/21+15/35 63/21+15/7 9/21+15/49