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Basic Calculations — Improve oral arithmetic ability; file - > PDF.

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This is an app to improve the calculation ability of addition, subtraction, multiplication and division. This app is very small, and it can be used offline. It can also scan ID cards and other documents to export PDF.
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cwtsd_w
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My neighbors often ask me if I have a good computing app. They need apps that can improve their oral arithmetic ability. So I developed this app.