Video MathXplosion, Ep 1: Magic 9s

TLF ID M024938

Follow these simple calculations to illustrate the special properties of the number 9. Pick your favourite number between 1 and 9 and multiply that number by 3. Add 3 to your answer. Multiply the result by 3. Treat your two-digit answer as two separate numbers and add them together. No matter what number you pick to start with, your answer will always be the same!





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  • Name: Australian Broadcasting Corporation
  • Organization: Australian Broadcasting Corporation
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  • Name: Australian Broadcasting Corporation
  • Organization: Australian Broadcasting Corporation
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  • URL: http://www.abc.net.au
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  • Organisation: Education Services Australia Ltd
  • Address: AUSTRALIA
  • URL: www.esa.edu.au
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