The Unit Digit Multiplication Trick

Tired of tedious multiplication? Discover a cool shortcut to find the unit digit of any multiplication problem instantly!

Subject: mental-calculation • Classes: 6–12 • Difficulty: basic (6-8)

The Trick

To find the unit digit of a product, just multiply the unit digits of the numbers involved. The unit digit of the result is the answer! Why? Because the other digits contribute to the tens, hundreds, and higher places and don't affect the unit digit. For example, to find the unit digit of $23 imes 47$, just multiply $3 imes 7 = 21$. The unit digit is 1.

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