Tapping into mathematics
Tapping into mathematics

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Tapping into mathematics

2 Using your calculator for basic arithmetic

2.1 The four rules of arithmetic

You are now going to use the four operation keys (on the bottom right-hand side of the TI-84 keyboard): , , and . You will also need the number keys and the key. If your calculator has an key, then use it instead of .

Exercise 1: Press and see

Press the following key sequences and check what answers you get:

  • (a) 5 7

  • (b) 5 7

  • (c) 5 7

  • (d) 5 7

  • (e) 7


On the TI-84 and many other calculators, you should get

  • (a) 5 7 gives 12

  • (b) 5 7 gives 2

  • (c) 5 7 gives 35

  • (d) 5 7 gives .7142857143

  • (e) 7 gives Ans × 7     5


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