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Addition, Subtraction, Multiplication, DivisionInquilineKea wrote:Okay. So (for anyone who wishes to answer), what types of mental math do a significant fraction of GRE-takers miss out on - that could help them on the test?
I think mental arithmetic may have some limited uses, e.g: card games and tricks, but in higher mathematics it helps in solving long involved computations. For example when dealing with astronomical quantities where approximations are useful the actual values wqill probably expressed as powers of ten, but the mental arithmetic will tell you if you're in the right ball park, versus by an exponential amount. ADS Press