# Which calculator>

The Texas Instruments TI-30Xa should be sufficient for all High School, and even college work. At the time we wrote this web page it was available online for under $12.00.

If your student is gifted technologically, then it's OK to buy them a fancy calculator that does all sorts of amazing things, but for most students, the simpler it is, the easier it will be to use.

## A basic scientific calculator should be able to:

- Multiply, divide, subtract and add.
- Square roots
- Inverses
- Exponents
- Sine, cosine and tangent and their inverses
- Logarithms

The Texas Instruments TI-30Xa that we recommended can do all of these things.

## Test your ability to use your calculator

See if you can work this out on your calculator. It seems simple, but have a go with your own calculator.

The answer you should get is 6.05 x 10^{-19 }to 3 significant
figures.

If this doesn't make sense to you, revise your knowledge of exponents here or have a look at our "How to use your calculator" guide.