Subtract 4 from 72: Base-10 Block Decomposition Problem

To solve this problem, we will perform a simple subtraction of the number of removed blocks from the total number of blocks.

• Step 1: Identify the total number of blocks and the blocks removed.
• Step 2: Use the formula for subtraction to determine the remaining blocks: $\text{Remaining blocks} = \text{Initial blocks} - \text{Removed blocks}$.
• Step 3: Perform the calculation.

Now, let's work through each step:

Step 1: We start with $72$ blocks and remove $4$ blocks.

Step 2: Using the subtraction formula mentioned, we compute:
$72 - 4 = 68$.

Step 3: Therefore, after removing 4 blocks, the number of blocks that remain is $68$.

Thus, the solution to the problem is $\mathbf{68}$.