Addition Problem: Finding the Sum of 45 + 19 Blocks

If we have 45 blocks and we add a further 19 blocks, how many blocks will we have in total?

To solve this problem, we need to find the total number of blocks after adding 19 blocks to an existing 45 blocks.

Step 1: Identify the numbers involved:

• Initial number of blocks: $45$
• Additional blocks: $19$

Step 2: Perform the addition calculation: $45 + 19 = 64$

Now, let's explain the addition in detail:

• Start by adding the ones place digits: $5 + 9 = 14$. Write down 4 and carry over 1 to the tens place.
• Next, add the tens place digits, along with the carry-over: $4 + 1 (carry) + 1 = 6$.

Thus, the total number of blocks is $64$.

The correct answer choice is: 4

Therefore, the solution to the problem is $64$.