If a child has 3 apples and buys 5 more, how many apples do they have?

To find out how many apples the child has after buying more, you can simply add the initial number of apples to the additional apples purchased. The child starts with 3 apples and buys 5 more.

The calculation involves the following steps:

1. Take the original number of apples: 3

2. Add the apples purchased: 5

So the equation looks like this:

3 (original apples) + 5 (bought apples) = 8 (total apples).

Thus, after performing the addition, the child has a total of 8 apples. This means the correct answer is 8.