The 15% Percent Power Play

Ever need to calculate 15% of a number fast, like for a tip or a discount? Stop reaching for the calculator! This trick will make you a percentage pro in seconds.

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

The Trick

To find 15% of any number, simply break it down! First, find 10% of the number. This is easy: just move the decimal point one place to the left. Next, find 5% of the number, which is exactly half of your 10% value. Finally, add these two results (10% + 5%) together. Why it works: $15\% = 10\% + 5\%$. By splitting the percentage into easier-to-calculate parts, you simplify the mental math significantly.

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