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Fill in the number pyramid where each cell equals the sum of the two cells directly below it. A classic arithmetic brain trainer.
You understand markets. Now trade them.
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Some numbers are given (locked). Fill in the missing numbers so that every cell equals the sum of the two cells below it. The top cell should be the grand total.
Work both upward (adding) and downward (subtracting). If you know the top and one of the two below, subtraction gives you the other.
Park, J. & Brannon, E.M. (2013). "Training the approximate number system improves math proficiency." Psychological Science, 24(10), 2013-2019.