This is a wasteful calculator.

If you feel that there is a lot of waste, please press the "mode change button" on the upper right.
Press the button to switch to "Normal mode".

You can also check the calculation history by pressing "log" in the upper left.
Although only 10 nearest records remain in history, I think that you can use it appropriately.
Sometimes a strange history remains, but please do not mind.

Calculators can only calculate up to 12 digits.
When calculating more than 12 digits, we recommend downloading other calculator application.