Subtract 9 Units from 79: Place Value Block Exercise

To solve this problem, we'll follow these steps:

• Identify the numbers involved, which are 79 and 9.
• Use the subtraction operation to compute $79 - 9$.
• Verify the result for any potential errors.

Now, let's calculate the solution:
Step 1: We have been given the number 79, from which we need to subtract 9.
Step 2: The subtraction $79 - 9$ is calculated as follows:

Write it vertically to subtract:

$\ \begin{array}{c} 79 \\ - 9 \\ \hline \end{array}$

Subtract 9 from 9 in the ones place, resulting in 0 in the ones place.
Subtract 0 from 7 in the tens place, resulting in 7 in the tens place.

$\ \begin{array}{c} 79 \\ - 9 \\ \hline 70 \\ \end{array}$

Therefore, the correct answer is $70$.

Concluding the calculations, the subtraction of 9 from 79 yields the result of $70$.