The very simplest calculator will have:
On/Off button
The ten digits 0-9
The four simple functions + - / x
Probably an '='
Thus minimum is 16, probably arranged in 4 rows of 4 buttons.
The simple buttons are usually to the right of the keyboard. They look like /, *, -, and +. For more complex buttons I have no idea how to get to them. But if you go to the calculator that is on the computer, you can click view, then scientific mode. This will bring up a scientific calculator with other symbols.
Yes, You wouldn't be able to do too much with a calcultor with no buttons...
by buttons.....
A scientific calculator typically has around 45 to 50 buttons, including numerical keys, mathematical function keys (such as addition, subtraction, multiplication, division), memory keys, trigonometric function keys, logarithmic function keys, and more. The exact number of buttons may vary slightly depending on the specific model and brand of the calculator.
To make a cardboard calculator, cut a rectangular piece of cardboard for the base, and then create smaller rectangles for the buttons and display. Use a marker to label the buttons with numbers and operations. You can create a simple mechanism by folding cardboard strips to act as levers for buttons and connecting them to a paper display that shows the output. Finally, assemble the parts using glue or tape, ensuring everything is securely attached.
adding
There are many simple interest calculators online that you can find. I found the one at http://easycalculation.com/simple-interest.php to be simple and accurate.
1, 2 and + are 3 buttons.
There are many places that one could buy an inexpensive and simple calculator. One could buy calculators at office supply stores like Staples or Office Max.
15.75 dollars * 6 = 94.50 dollars. So simple with a calculator!15.75 dollars * 6 = 94.50 dollars. So simple with a calculator!15.75 dollars * 6 = 94.50 dollars. So simple with a calculator!15.75 dollars * 6 = 94.50 dollars. So simple with a calculator!
Mortgage Calculator offers a free mortgage web based calculator. You can also look at your banking institution; as many do offer this for free on their pages when seeking a mortgage.
A simple mortgage calculator is a device which will calculate mortgage figures. A mortgage calculator may also be an accountant who derives the figures through accounting.