In order to add fractions, both fractions must have the same denominator.
A denominator is the lower number of a fraction.
In the fraction

, the denominator is 7.
In the fraction

, the denominator is 14.
Since 7 ≠ 14, you must find the LCM (least common multiple) of 7 and 14.
To do this, list the multiples of 7 and 14 separately until you find one that both numbers share.
7 • 1 = 7
7 • 2 = 14
14 • 1 =
14
The LCM of 7 and 14 is 14.
This means that the common denominator that these fractions will be converted to fit will be 14.
Since 7 • 2 = 14, which is what the denominator needs to be, you must also multiply the numerator, or upper number of the fraction, by 2.
3 • 2 = 6
=

and
now have common denominators and you can add them together!
To add fractions with common denominators, simply add the numerators and the denominator stays the same.
+
=

6 + 5 = 11
is sum of
, which is an equivalent fraction to
, and
.
Hope this helps!