"key concept" is not a mathematical term . A key concept is an important idea.
Two key concepts in math are derivatives and integrals of functions. ( "function" is also a key concept.)
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what does key mean in math
A math concept is how you solve a math problem or the ideas. You usually have to memorize math concepts.
There is no such concept in maths. A plane figure is a mathematical concept but that is not what the question is about.
zero
The concept of an opposite is simple. The opposite of a number is a negative. For example, the opposite of 35 is -35.