Mental Math: Shortcut Tricks to Improve Number Manipulation Skills 1 by Itano...
14,29 €
Number manipulation can be a challenging task, but the good thing is that math problem can be solved in a variety of ways depending on the level of understanding of the learner. You can use the simple techniques in this book to do math faster than a calculator effortlessly in your head, even if you have no inclination for math.
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