Your geekling needs to have happy math memories, which is why you should totally get them a Tidy Ruler. It’s made of beautiful, sturdy rosewood and looks very old school, except when you notice the nifty added features.
A pencil groove is carved into the top to keep your pencil from rolling away. And a pencil sharpener is built into one side, so you never have to get up in the middle of class to sharpen up your writing utensil. It even measures in inches and centimeters, in the name of diplomatic relations and great justice.