Calculate the Square Root of 68: Finding the Best Approximation

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

• Step 1: Identify the tens and units digits of the number 68.
• Step 2: Use rounding rules to determine if we round up or down.
• Step 3: Replace the units digit appropriately to find the rounded number.

Now, let's work through each step:
Step 1: The tens digit of 68 is 6, and the units digit is 8.
Step 2: Since the units digit (8) is 5 or greater, we round up the number 68.
Step 3: After rounding up, we replace the units digit with 0, resulting in the rounded number 70.

Therefore, the solution to the problem is $70$.