i would define the word compare as a number, angle, shape, ect. that is different and try to see what comparisons they have.
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They define irrational numbers
A cashier uses math to define the total value of the items you buy.
There is no such thing as "Straght" in math: the word does not [yet] exist in the English language. It is not easy to define "staright". You start off with a set of primitive mathematical concepts and then define other concepts using them. A straight line is a primitive geometric concept: it is the shortest distance between two distinct points in a plane. [You will probably need to use the concept of straight to define shortest!]
you compare something
.. with another math problem.... See if the question is the same or different.