What is the answer to this fractions 1/3 + 2/7

use a common denominator of 21

thanks

To find the answer to the fraction 1/3 + 2/7, you need to first find a common denominator for both fractions.

To do this, you can find the least common multiple (LCM) of the denominators, which is the smallest number that both 3 and 7 divide into evenly. In this case, the LCM of 3 and 7 is 21.

Next, you need to convert both fractions so that they have the same denominator of 21. To do this, you multiply the numerator and denominator of each fraction by the same number that turns the original denominator into 21.

For the first fraction, you multiply the numerator and denominator by 7:
1/3 * (7/7) = 7/21

For the second fraction, you multiply the numerator and denominator by 3:
2/7 * (3/3) = 6/21

Now, you can add the two fractions together:
7/21 + 6/21 = 13/21

Therefore, the answer to the fractions 1/3 + 2/7 is 13/21.