Calculate Any Percentages in 3 seconds (don't teach anyone)

Описание: Most students struggle with mental percentage calculations because they view them as static arithmetic problems. They attempt to calculate difficult values directly, often resorting to long division or calculators, unaware that the structure of the equation can be manipulated to their advantage.

In this video, we explore a fundamental yet often overlooked principle of mathematics: the commutative property of multiplication. Since a percentage is simply a fraction over 100, the operation is multiplication, and the order of the terms does not matter.

We demonstrate how reversing the values—calculating Y% of X instead of X% of Y—can instantly simplify a complex problem into a trivial one. This is not a magic trick; it is a logical application of arithmetic rules that allows for rapid mental calculation. Master this concept, and you will no longer require a calculator for percentages.

Keywords:

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