# Data Types\Number\ Expression

This node can evaluate an expression, then[![komeeqn57image.png](https://simlab-soft.com/help/uploads/images/gallery/2025-09/scaled-1680-/hulkomeeqn57image.png)](https://simlab-soft.com/help/uploads/images/gallery/2025-09/hulkomeeqn57image.png)

the result of this evaluation can be used to activate other responses.

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#### Example

In the example below when the "**Import\_UPS**" geometry is clicked "**Evaluate Number Expression**" is executed. The expression is simple math.sqrt(16), and the result is linked to the "**Set Number Variable**" node, in "**result**" variable. This variable is then linked to a "Variable Writer" to display it.

[![image.png](https://simlab-soft.com/help/uploads/images/gallery/2025-09/scaled-1680-/7ynimage.png)](https://simlab-soft.com/help/uploads/images/gallery/2025-09/7ynimage.png)