{% load mathfilters %}

...

Basic math filters


    
8 + 3 = {{ 8|add:3 }}

    
13 - 17 = {{ 13|sub:17 }}

    {% with answer=42 %}
    
42 * 0.5 = {{ answer|mul:0.5 }}
    {% endwith %}

    {% with numerator=12 denominator=3 %}
    
12 / 3 = {{ numerator|div:denominator }}
    {% endwith %}

    
|-13| = {{ -13|abs }}