A Graphic showing the rules for adding positive and negative numbers. Part of a series in <a href="//commons.wikimedia.org/wiki/User:Kismalac/conjuntos" title="User:Kismalac/conjuntos">elementary mathematics</a>.
<ul><li><a href="//commons.wikimedia.org/wiki/File:AdditionRules.svg" title="File:AdditionRules.svg">AdditionRules.svg</a>: <a href="//commons.wikimedia.org/wiki/User:Ezra_Katz" title="User:Ezra Katz">Ezra Katz</a></li></ul>
derivative work: <a href="//commons.wikimedia.org/wiki/User:Kismalac" title="User:Kismalac">kismalac</a>
CC BY-SA 3.0
Own work based on: <a href="//commons.wikimedia.org/wiki/File:AdditionRules.svg" title="File:AdditionRules.svg">AdditionRules.svg</a>