Abacus. Beads that can be shuffled back & forth on strings in a frame. Can be really effective in the hands of a skilled user.
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a tool used to draw straight lines or measure straight lines miss pawz: a measuring instrument :)
UR BRAIN STUFF. Or a cauclator...
It is called a protractor.
A protract is a tool used in math class. You generally start learning how to use it in 5th grade. A protractor is used to measure the angle between two lines that intersect.
math is used to show people the different ways math can be used such as fractions or decimals you name it