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MathXplosion
The Danish Elephant
Amaze your friends with your mind-reading super skills. Here's a brain game you can play by asking just a few questions and substituting letters for numbers! This episode demonstrates how following a specific sequence of arithmetic steps and the special properties of 9 will always result in the same answer, in this case the number 4. The result of step 3 will always yield 9, so subtracting 5 always yields 4.