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LEARN · Week 5 · Tools & formats

Make It Do the Math

You pasted the eleven line items from a vendor's quote into a chat and asked for the total with 8.25% sales tax. The answer came back in two seconds, down to the cent, and you typed it into the purchase request. Accounting's total came out $140 lower. Theirs was right. Nothing in the chat looked wrong.

By the end of this lesson

  • You save one standing rule that sends every numeric job to code.
  • You check a total by its count, its inputs and a rough sum in your head.
  • You can say why a predicted number looks right even when it is wrong.
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