Hi,
Look on the back of the calculator. There should be a rectangle (rounded) where it says Casio and under it Rating. You should find there the battery type. For example, if it says LR44x1, you need one battery LR44 or equivalent. Different manufactures use different reference numbers.
Alternatively you may open the battery compartment, and read the reference number on the battery itself.
Hope it helps.
Hope
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