# Multiply Variable

**Multiply Variable** node is designed to perform multiplication operations on a specified variable and store the result back in the same variable. This node is useful for scaling up values, applying factors, or performing compound calculations within your workflow.

### Properties Panel

| **Field**     | **Description**                                                | **Required** |
| ------------- | -------------------------------------------------------------- | ------------ |
| Node name     | [Node Name](https://docs.cosmocloud.io/flow-builder/node-name) | true         |
| Variable Name | The name of the variable whose value will be multiplied        | true         |
| Value         | The value by which the variable will be multiplied             | true         |

### Usage

1. Specify the name of the variable whose value you want to multiply.
2. Enter the value (the value by which the variable will be multiplied).

### Behaviour

* The node will retrieve the current value of the specified variable.
* It will then multiply this value by the provided multiplier.
* The result of the multiplication will be stored back in the same variable, overwriting its previous value.
* If the variable doesn't exist, it'll raise an error.

### Returns

The node updates the value of the specified variable with the result of the multiplication. You can access this updated value using Magical Autocomplete (e.g., `$.variables.<variable_name>`) in any node below this node.

### Example

Let's say you want to apply a 20% increase to a price:

1. Set Variable name to `$.variables.product_price`
2. Set Multiplier to `0.5`

If it exists and `product_price` was `10`, it will now be `5`.

### Best Practices

* Ensure that the variable you're dividing contains a numeric value to avoid type conversion errors.
* Consider adding a check for division by zero before this node if there's any chance the divisor could be zero.
* Ensure that the variable is initialised earlier