Question 1092609
Using the number 6,435, answer the following questions referring to base 8.
In what place is the 4?
What is the value of the digit 4 in this number? 
----------------
The values are powers of 8, increasing for right to left.

<pre>
 8^3   8^2     8^1    8^0
x512   x64      x8     x1

</pre>

Only base 2, 10 and 16 are of practical value.
Octal, base 8, was used for a while, but there was no good reason for it.