We have looked, in previous lessons, at the types of information that can be stored on computers, and what is actually stored on the hard disc when we save things like pictures and sounds. This task tests your understanding of what can happen when we try to move that information from place to place.
First, multiply each of the digits by their position
Find the total of the numbers calculated in step i:
Divide the total from step ii by 11:
The remainder is the check-digit, so the whole number becomes 64933