Finding Missing Blocks: Making 48 Blocks Divisible by 10

In total we have 48 blocks. How many ones do we need to add in order for the number of blocks to be divisible by 10?

To solve this problem, follow these steps:

• Step 1: Identify the remainder of 48 when divided by 10.
• Step 2: Calculate how many blocks need to be added to remove the remainder and reach the next multiple of 10.

Let's work through these steps:

Step 1: Calculate $48 \mod 10$.
When 48 is divided by 10, the quotient is 4 with a remainder of 8. Thus, $48 \mod 10 = 8$.

Step 2: Since we want the total number of blocks to be divisible by 10, we need to reach the next multiple of 10, which is 50.
To find out how many blocks need to be added, subtract the remainder from 10:
$10 - 8 = 2$.

Therefore, we need to add 2 blocks to the original 48 blocks to make the total divisible by 10. Hence, the correct choice is 2.