Addition Problem: Finding the Sum of 17 and 25 Blocks

To solve this problem, let's begin by stating the numbers involved in the addition:
- We start with an initial number of blocks: $17$.
- Then, we add an additional number of blocks: $25$.

We need to find the sum of these two numbers to determine the total number of blocks:

• $17 + 25$

Let's compute the sum:
To find $17 + 25$, we can add the numbers directly:

• First, add the ones place: $7 + 5 = 12$, which gives us 2 in the ones place and carry over 1 to the tens place.
• Then, add the tens place numbers: $1 + 2 + 1 = 4$.

This calculation results in the total number of blocks being $42$.

Therefore, the correct answer to the problem is $42$.