Adding and subtracting denominators

6/7 + 1/3

First you need to make both denominators the same number.

The number we can use is 21.

6/7 : to make the denominator 21, you need to multiply the numerator and the denominator by 3.

6 * 3 = 18

7 * 3 = 21

The equivalent is 18/21

1/3 : to make the denominator 21, you need to multiply the numerator and the denominator by 7.

1 * 7 = 7

3 * 7 = 21

The equivalent is 7/21

18/21 + 7/21 = 25/21 = 1 4/21