To calculate the value of 3/4 + 1/2, we need to find a common denominator for the two fractions. The common denominator for 4 and 2 is 4.

Now, we can rewrite the fractions with the common denominator:

3/4 + 1/2 = (3/4) + (2/4)

Next, we can add the numerators together:

(3/4) + (2/4) = 5/4

Therefore, the value of 3/4 + 1/2 is 5/4.