ref: 7759a98f713a3ff5359c486118e1fb2cf1799b28
dir: /docs/content/functions/math.md/
---
title: Math
description: Hugo provides six mathematical operators in templates.
godocref:
date: 2017-02-01
publishdate: 2017-02-01
lastmod: 2017-02-01
#tags: [math, operators]
categories: [functions]
menu:
docs:
parent: "functions"
toc:
signature: []
workson: []
hugoversion:
relatedfuncs: []
deprecated: false
draft: false
aliases: []
---
There are 6 basic mathematical operators that can be used in Hugo templates:
| Function | Description | Example |
| -------- | ------------------------ | ----------------------------- |
| `add` | Adds two integers. | `{{add 1 2}}` → 3 |
| `div` | Divides two integers. | `{{div 6 3}}` → 2 |
| `mod` | Modulus of two integers. | `{{mod 15 3}}` → 0 |
| `modBool`| Boolean of modulus of two integers. Evaluates to `true` if = 0. | `{{modBool 15 3}}` → true |
| `mul` | Multiplies two integers. | `{{mul 2 3}}` → 6 |
| `sub` | Subtracts two integers. | `{{sub 3 2}}` → 1 |
## Use `add` with Strings
You can also use the `add` function with strings. You may like this functionality in many use cases, including creating new variables by combining page- or site-level variables with other strings.
For example, social media sharing with [Twitter Cards][cards] requires the following `meta` link in your site's `<head>` to display Twitter's ["Summary Card with Large Image"][twtsummary]:
```html
<meta name="twitter:image" content="http://yoursite.com/images/my-twitter-image.jpg">
```
Let's assume you have an `image` field in the front matter of each of your content files:
```yaml
---
title: My Post
image: my-post-image.jpg
---
```
You can then concatenate the `image` value (string) with the path to your `images` directory in `static` and leverage a URL-related templating function for increased flexibility:
{{% code file="partials/head/twitter-card.html" %}}
```html
{{$socialimage := add "images/" .Params.image}}
<meta name="twitter:image" content="{{ $socialimage | absURL }}">
```
{{% /code %}}
{{% note %}}
The `add` example above makes use of the [`absURL` function](/functions/absurl/). `absURL` and its relative companion `relURL` is the recommended way to construct URLs in Hugo.
{{% /note %}}
[cards]: https://dev.twitter.com/cards/overview
[twtsummary]: https://dev.twitter.com/cards/types/summary-large-image