Lightning 11x Multiplier!

Struggling with multiplying by 11? What if you could do it in seconds, without a calculator? Unleash your inner math wizard!

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

The Trick

To multiply any two-digit number by 11, simply split the digits of the number you're multiplying. Then, add those two digits together and place the sum in the middle! If the sum is a two-digit number, carry the tens digit over to the first digit. WHY it works: When you multiply a number $N$ by 11, it's the same as $N \times (10+1) = (N \times 10) + N$. This trick is a visual shortcut for this operation, effectively adding the number to itself shifted one place value.

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