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→Knows the inverse relationship of multiplication and division
<gallery>
<gallery>
File:Sliderule-inverse.png|Slide ruler [[Activities/Sliderule]]
File:Sliderule-inverse.png|Slide ruler [[Activities/Sliderule]]
File:Napier-bones.png|Napier's bones
File:Napier-bones.png|Napier's bones [http://activities.sugarlabs.org/en-US/sugar/addon/4429]
File:TurtleArt-inverse.png|Turtle Art project
File:TurtleArt-inverse.png|Turtle Art project