Multiply each of the first five digits by 1,2,3,4 and 5 respectively and add the results.

The check digit is the remainder when this total is divided by 9.

Example : The number 34167

3 x 1 = 3
4 x 2 = 8
1 x 3 = 3
6 x 4 = 24
7 x 5 = 35

3 + 8 + 3 + 24 + 35 = 73

73 divided by 9 = 8 remainder 1

So the check digit is 1....341671 is a valid ID number.

Decide which of the following identification codes are valid and which are invalid...

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