040409004223

• 0 — Number system
• 40409 — Manufacturer code
• 00422 — Product code
• 3 — Check digit (confirms the number is well-formed)

UPC-A ✓ Valid check digit

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• 030554083532 — Creative teaching press book addition&subtractn gr 1-2 ctp8353
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Creative teaching press book critcl thinking math 2-4 lw422

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