What is the sum of 8 and 15?

To find the sum of 8 and 15, you simply add the two numbers together. This can be done the way we typically perform addition. Start with 8 and count up an additional 15.

Here's a step-by-step breakdown:

1. Start at 8.

2. Add 10 to get to 18 (8 + 10 = 18).

3. Then, add 5 more to reach the final sum (18 + 5 = 23).

Therefore, the correct answer is 23. This indicates a complete understanding of addition, where the total combines both individual values into one. The other values provided do not represent this combination accurately, illustrating that it's essential to conduct the addition carefully to arrive at the correct total.