re: (Not Common Core)-- Why are they teaching math this way?

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The point is the word was not taught as a vocabulary word. The meaning was not taught in class. Are you sure of this? That doesn't make very much sense.

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Yes, and I agree.

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When will you ever need to solve for subtrahend outside of the first 3 grade levels? You will solve for one of the above terms even if the process calls for subtraction. When will I ever use differential equations in my profession? Answer is never. Yet somehow it was still required of me to pass that class.

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There is a difference in teaching concepts which may or may not be used in the future and teaching frequently utilized concepts, through means of outdated nomenclature that will not be used in the future.

At no point have I asked why he needs to learn subtraction.