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.
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.
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.