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What’s the trick to multiplying numbers by 5 quickly in your head?
Updated: 11-Apr-2025

To multiply any number by 5 mentally, divide it by 2 and multiply by 10. For example, 36 × 5: half of 36 is 18, and 18 × 10 is 180.

This trick works because 5 = 10 ÷ 2. It’s especially useful for large numbers, saving time and reducing mental strain during quick calculations.

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