The Percentage Power-Up!

Ever wish you could calculate percentages like a wizard? What if you could find $27\%$ of $150$ in your head, faster than a calculator?

Subject: mental-calculation • Classes: 6–12 • Difficulty: intermediate

The Trick

Unlock percentage magic by breaking it down! To find $X\%$ of a number, first find $10\%$ by moving the decimal one place left. Then find $1\%$ by moving it two places left. Any percentage can be built from these blocks. For example, $20\% = 2 \times 10\%$, $3\% = 3 \times 1\%$. This works because $10\%$ is $\frac{1}{10}$ and $1\%$ is $\frac{1}{100}$ of the number, allowing easy mental multiplication and addition.

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