Teacher Quan — Private Computer Science Teacher← Ch.2

Check Digits

Interact

ISBN-13 · data entry check

Barcode / book numbers

Not started
1
9
2
7
3
8
4
0
5
3
6
4
7
0
8
9
9
8
10
3
11
8
12
2
CD
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Check digit

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Verification

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Press Step to begin