Calculators Repeat Calculations: Try pressing the following keys: - 4 + = = = = = = (with some calculators it is necessary to press the operation button twice) - 2x====== - 100 – 2 = = = = = -6+5===== What happens? What do you notice? Use this trick to turn your calculator into a counting machine which counts in steps of any size. Clear Button: When typing a calculation, it is easy to press the wrong button. If you are typing a long calculation it would be a waste of time to start all over again. The ON/C button when pressed once will clear only the last key typed. If pressed twice it will clear the entire calculation. Memory Key: Calculators will do operations in the order they are typed. This is a problem if you need to do several calculations and use the results from one in another. If I wanted to find the total cost of 3 items, then find change from £10 I could use the memory key: M+ will add the number on the display to the memory. M- will subtract the number on the display from the memory. MRC when pressed once will display what is in the memory (recall); when pressed twice will clear the memory. Eg: For the above problem I would type: 2.55 + 2.98 + 3.15 = M+ 10 – MRC = When the memory is in use, a small M will appear on the display. If starting a new calculation, ensure that the memory is cleared first. Positive/ negative numbers: The +/- button will change the number typed to negative (or back to positive). If the number shown is negative a – symbol will appear at one side of the screen.
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