Django template add numbers

{% extends 'base.html'%} {% block contenido %}
<h1>Checkout</h1>
<p>Subtotal + IVA: ${{ orden.sub_total }}</p>
<p>Envio:$ {{ orden.costo_envio }}</p>
<p>Total a pagar:$ {{ orden.sub_total|add:orden.costo_envio }}</p>
{% endblock %}

Source: stackoverflow.com

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