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How To Calculate Check Digit (MOD 10)


How do I create a formula that will calculate a check digit for a 9-digit number using MOD 10? The weighting is 212121212. The problem I am having is that if the sum of the product is in double digits, they must be treated as individual digits.

Example:

Number To Be Calculated: 0 0 4 4 5 5 5 2 5

Weighting: 2 1 2 1 2 1 2 1 2

Sum: 0+0+8+4+1+0+5+1+0+2+1+0

22/10 = 2 r2
10-2 = 8 (Check Digit)

Is it possible to create such a formula? I need to calculate several hundred and do not want to do this manually!


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