# Four-function calculator

A four-function calculator is a calculator that can perform basic operations such as addition, subtraction, multiplication and division. Such calculator can also have functions such as the square root and the exponent. ## Basic operations using a four-function calculator

Just hit the following buttons in the order given.

six → zero →add →three →two →decimal point →five→equals.

The display will show 92.5.

Subtraction : 21 - 40

Just hit the following buttons in the order given.

two → one →subtract → four → zero → equals.

The display will show -19.

Subtraction : -8 + 6

Just hit the following buttons in the order given.

eight → change sign → plus → six → equals.

The display will show -2

Subtraction : 10 - (- 6)

Just hit the following buttons in the order given.

one→ zero→ subtract→ 6→ change sign → equals.

The display will show 16

Multiplication : 9 × 7

Just hit the following buttons in the order given.

nine → multiply → seven → equals.

The display will show 63

Division : -20 ÷ -5

Just hit the following buttons in the order given.

two → zero → change sign→ divide → five → change sign → equals

The display will show 4

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