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# Arithmetic

In order to avoid silly mistakes
As a math idiot
I want to be able to perform arithmetic on the calculator

When $a \ne 0$, there are two solutions to $(ax^2 + bx + c = 0)$ and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$

• Tags: @arithmetic, @fast

$50 + 70 = 120$

• # In the DHTML version, the description will be rendered with mathematical formulas if the experimental features are enabled. Given I have entered 50 into the calculator
• And I have entered 70 into the calculator
• Then the result should be 120 on the screen
• Tags: @arithmetic, @fast

## Subtract two numbers

• Given I have entered 50 into the calculator
• And I have entered 70 into the calculator
• When I press subtract
• Then the result should be -20 on the screen
• Tags: @arithmetic, @fast

## Multiply two numbers

• Given I have entered 50 into the calculator
• And I have entered 70 into the calculator
• When I press multiply
• Then the result should be 3500 on the screen
• Tags: @arithmetic, @fast

## Divide two numbers

• Given I have entered 50 into the calculator
• And I have entered 2 into the calculator
• When I press divide
• Then the result should be 25 on the screen