Final answer:
The value of the digit 8 in the number 86 is 80, because 8 is located in the tens place.
Step-by-step explanation:
When using the number 86, the value of 8 is found by looking at the position of the digit within the number. The digit 8 is in the tens place, which means that the value of 8 in the number 86 is 80. To confirm this, we can set up our unit conversion by writing the units we have and multiply them by the conversion factor to ensure the units cancel out as follows: 80x, where x is the position value (in this case, 10 for the tens place), confirming that the value is indeed 80.