My ideal classroom!

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Across
  1. 1. A device to perform mathematical operations such as addition, subtraction, multiplication, and division.
  2. 2. Something you can sit on.
  3. 3. A written or printed work made of pages bound together inside a cover.
Down
  1. 1. A soft, white limestone rock used for writing and drawing.
  2. 2. A device used to measure, record, and display time.