Big Button Calculator -BB Calc

Big or Large Button Simple Calculator especially for the Elderly or the Senior

BIG-SIZE BUTTONS - Easy to CLICK !!
LARGE NUMBER FONTS - Easy to READ!!
USEFUL especially FOR the ELDERLY or the SENIOR!!


Simple and useful mobile calculator app
Features :
- The size of button (especially '0' and '+' buttons) are as enlarged as
possible, by displaying essential buttons only.

- Click-edit and backspace-button are available.

- Negative sign number calculation (eg. 2 x -5) can be performed.

- Calculation history is available.
- Shortcut for history is also available through navigation drawer.

- Single/multiple lines can be selected.

- You can do power (n-square) calculation : xx → ^
- parenthesis can be used
.. → (
++ → )
- % function is usable : ÷÷ → %
( +, - :
a + b% = a + a x b x 0.01 [ = b% + a ]
a - b% = a - a x b x 0.01
a% + b% = a x 0.01 + b x 0.01

For the other operators : b% = (b x 0.01)
(ex.) a x b% = a x(b x 0.01)
a ÷ b% = a÷(b x 0.01) [ = a÷b x 100]
a^b% = a^(b x 0.01)
a% x b% = (a x 0.01) x (b x 0.01)

a + b% + c% = a + a x b x 0.01 + (a + a x b x 0.01) x c x 0.01
[∵ arithmetic priority : left > right ]

a + b% x c = a + (b x 0.01) x c [∵ arithmetic priority : x > + ] )