A keyboard with a built-in calculator provides a convenient way to perform basic arithmetic operations without needing a separate calculator application. This tool typically includes a standard keyboard layout along with a dedicated calculator section for quick calculations.

## Inputs

**Number 1 (N1)**: The first number in the calculation.**Number 2 (N2)**: The second number in the calculation.**Operation (O)**: The arithmetic operation to be performed (addition, subtraction, multiplication, division).

## Formulas and Calculations

The calculator can perform basic arithmetic operations using the following formulas:

## 1. Addition

[ \text{Result} = N1 + N2 ]

## 2. Subtraction

[ \text{Result} = N1 – N2 ]

## 3. Multiplication

[ \text{Result} = N1 \times N2 ]

## 4. Division

[ \text{Result} = \frac{N1}{N2} ]

## Example Calculation

**Inputs:**

- Number 1 (N1): 8
- Number 2 (N2): 4
- Operation (O): Addition

**Addition:**

[ \text{Result} = 8 + 4 = 12 ]

**Inputs:**

- Number 1 (N1): 8
- Number 2 (N2): 4
- Operation (O): Subtraction

**Subtraction:**

[ \text{Result} = 8 – 4 = 4 ]

**Inputs:**

- Number 1 (N1): 8
- Number 2 (N2): 4
- Operation (O): Multiplication

**Multiplication:**

[ \text{Result} = 8 \times 4 = 32 ]

**Inputs:**

- Number 1 (N1): 8
- Number 2 (N2): 4
- Operation (O): Division

**Division:**

[ \text{Result} = \frac{8}{4} = 2 ]

## Summary

A keyboard with a built-in calculator can perform basic arithmetic operations such as addition, subtraction, multiplication, and division. For the given example with numbers 8 and 4, the results for the different operations are:

- Addition: 12
- Subtraction: 4
- Multiplication: 32
- Division: 2
- .

### Table of Example Calculations

Operation | Number 1 (N1) | Number 2 (N2) | Result |
---|---|---|---|

Addition | 8 | 4 | 12 |

Subtraction | 8 | 4 | 4 |

Multiplication | 8 | 4 | 32 |

Division | 8 | 4 | 2 |

### Conclusion

The keyboard with a built-in calculator is a handy tool for quick calculations. It allows users to perform arithmetic operations directly from their keyboard, enhancing efficiency and convenience