To simplify the expression 3/8 + 1/4 + 1/2 - 2/3, we can find a common denominator and combine the fractions.
The common denominator for 8, 4, 2, and 3 is 24.
Converting each fraction to have a denominator of 24:
3/8 = 9/24
1/4 = 6/24
1/2 = 12/24
2/3 = 16/24
Now we can combine the fractions:
9/24 + 6/24 + 12/24 - 16/24 = 11/24
Therefore, 3/8 + 1/4 + 1/2 - 2/3 is equal to 11/24.