Just jam the paper in there holding the feed button until it starts feeding through!
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At the very back of the calculator under the paper roller there is a very thin horizontal slot. Insert the tip of the paper roll into the slot, then press the paper advance button located on the top left hand side of the calculator until you see the paper.
to tread paper into
Yes if pi=22/7.
to tell you the truth you'll find out on the day
Any calculator that prints on paper can be set to print everything as it goes into the calculation. There are calculator programs on computers that include a "tape" that shows work, as well. A number of more recent calculators also show work on the graphical display.