This Math quiz is called 'Algebra - Proof' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.
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This algebra quiz helps to show you how important it is to be exact in math. If you can find a simple proof that precisely describes all cases of a particular situation it can save having to check a lot of different values.