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Holiday Puzzle #11 – Odd’s Only

The ladder of success is best climbed by stepping on the rungs of opportunity” – Ayn Rand

Here’s a new original puzzle that goes along with last Thursday’s puzzle, Even’s Only.  In the same theme, this is another great challenge for everyone. It emphasizes combining odd numbers (3,5,7 and 9) with addition, subtraction, multiplication and division using the rules of order of operations.

The rules are simple:

1. Use only the numbers 3, 5, 7 and 9

2. Use each number once and only once

3. Use any of + – x / to combine the numbers

4. Use parenthesis () as desired

5. Following rules 1-4, make the numbers 0-9

For example, “10” can be made as “9 + 5 + 3 – 7″. In this example, each number (3,5,7,9) was used once and only once as required. There are other ways to make “10” which would also work.

I put together a little interactive program for this puzzle. You can enter your answers for each number and then select check. Your answers will be scored and a response provided (e.g. “got it!” or “need to use 3,5,7 and 9″). Give it a try and let me know what you think. Click here for a pdf file.


I hope you enjoy this puzzle. Good luck and pass it onto others who may enjoy them!

In order to use the interactive puzzle, you need to have adobe flash enabled.

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