31/2 + 11/2=
the denominator is the same, all you have to do is add the numerators, but keep the denominator the same. Then you simplify, if possible.
So it is just (31+11)/2
To add fractions, you need to have the same denominator. In this case, the denominators are already the same, which is 2.
To add the fractions, simply add the numerators (the numbers on top) and keep the denominator the same.
So, 31/2 + 11/2 = (31 + 11)/2 = 42/2
Now, you can simplify the fraction by dividing both the numerator and denominator by their greatest common divisor. In this case, the greatest common divisor of 42 and 2 is 2.
Dividing both 42 and 2 by 2, we get:
42/2 = 21/1
Therefore, 31/2 + 11/2 simplifies to 21/1 or simply 21.