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This document provides methods for quickly multiplying numbers by 5, 25, and 125. It also describes a trick for multiplying two numbers that differ by a small even number using squares. Specifically, it notes that to multiply by 5, multiply by 10 and divide by 2. To multiply by 25, multiply by 100 and divide by 4. And to multiply by 125, multiply by 1000 and divide by 8. It then explains that if two numbers differ by 2, their product is the square of the number between them minus 1. If they differ by 4,

Author

krsnagnani

Language

EN