On the CASIO fx-83gt PLUS factorising is done like this:

- Entering the number,
- press equals,
- SHIFT and
**., ,,,** (this has “FACT” written above it in yellow).
- The Prime Factor Form is displayed as the answer.
- If the number is Prime, then the number itself is displayed.

This is a natural way to introduce what indices mean, because the CASIO gives the answers in index form eg 3^{4} rather than 3x3x3x3

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