How to easily multiply any number by twelve | Summary and Q&A

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April 30, 2014
by
tecmath
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How to easily multiply any number by twelve

TL;DR

Learn how to quickly multiply any number by 12 using a simple doubling and neighbor addition method.

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Questions & Answers

Q: How does the method for multiplying by 12 work?

The method involves doubling each digit and adding the neighbor to the right. This allows for fast multiplication without complex calculations.

Q: What happens when there is a carry number in the calculation?

When a carry number occurs, it is added to the next calculation. For example, if doubling a digit results in a number greater than 9, the extra digit is carried over to the next calculation.

Q: Can this method be used for multiplying by numbers other than 12?

Yes, the doubling and neighbor addition method can be applied to other numbers as well. However, the specific steps will vary depending on the multiplier.

Q: Are there any limitations to this multiplication trick?

This trick works effectively for multiplying by 12, but it may not be as efficient for other numbers. It is recommended to practice and understand the method for each specific multiplier.

Summary & Key Takeaways

  • This video teaches a method to multiply any number by 12 quickly by doubling each digit and adding the neighbor to the right.

  • The method is demonstrated with two examples, showing how to multiply smaller and larger numbers by 12.

  • It is emphasized to remember to include zeros and carry numbers across when using this method.

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