CalculationBook is very easy to use .
Formula is displayed, you don’t need to worry about the input mistake .
Before pressing "=" , It calculate an answer automatically.

◆ You can check previous calculations .
•Dragging down the list of calculation, you can hide the keyboard for more space.
· You can fix an old calculation. To fix, tap the line. Or tap the number or operator that you want to modify.
• You can delete the duplicate by swiping.

◆ “Total Bar "
• Total bar shows the sum of all rows automatically .
· It is useful for such total amount of shopping.
· You can show or hide the total bar on the keyboard .

◆ Calculation can refer results of the other calculation.
· In order to refer, please tap the part of the answer.
• If you fix a calculation, all calculations that refer it will be updated automatically.

◆I can calculate the long formula that uses a variety of functions and brackets.