# How to Change Positive Number to Negative in Javascript

In this tutorial, you will learn how to change positive number to negative in javascript. Making calculations without using numbers is challenging. You can create a number by combing the digits 0 through 9. For a newbie developer, it can be a bit tricky to change positive number to negative number.

There are numerous ways to change positive number to negative number. But for the sake of simplicity, we will make use of  `Math` object.  This object contains a lot of methods and properties which can help us in various mathematical operations. One of those methods is the `abs()` method.

The `abs()` method returns an absolute value of a number. Finding a number’s distance from zero will allow you to establish its absolute value regardless of which way it is moving along the number line. A number’s absolute value is its value after any prior negative sign has been eliminated. The absolute value of -7 is 7.

In the following example, we have an input field in which we will enter a random number. Upon click of a button, we will change positive number to negative number and display that on the screen.  Please have a look over the code example and the steps given below.

HTML & CSS

• We have 4 elements in the HTML file (`div``input``button`, and `h1`). The `div` element is just a wrapper for the rest of the elements.
• The `innerText` for the `button` element is `“Get”` and for the `h1` element, it is `“Result”`.
• We have done some basic styling using CSS and added the link to our `style.css` stylesheet inside the `head` element.
• We have also included our javascript file `script.js` with a `script` tag at the bottom.
```<!DOCTYPE html>
<html lang="en">

<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>

<body>

<div class="container">
<input type="number" placeholder="Enter Number">
<button>Get</button>
<h1>Result</h1>
</div>

<script src="script.js"></script>
</body>

</html>```
```.container {
text-align: center;
}

button {
margin-top: 10px;
}

input {
display: block;
margin: 10px auto;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
-webkit-appearance: none;
margin: 0;
}```

Javascript

• We have selected the `input` element, `button` element, and `h1` element using the `document.querySelector()` method and stored them in `input``btnGet`, and `output` variables respectively.
• We have attached a `click` event listener to the `button` element.
• In the event handler function, we are storing the value of the `input` element in the `num` variable.
• We are calling the `abs()` method to get the absolute of `num` and we are prefixing it with negative sign.  We are storing the number in the `result` variable.
• We are displaying the `result` in the `h1` element using the `innerText` property.
```let input = document.querySelector("input");
let btnGet = document.querySelector("button");
let output = document.querySelector("h1");