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December 2007 Vol. 8 Issue 12


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Math Mania puzzles feature "Rule of 24"

The December Math Mania will feature the "Rule of 24." And your understanding of the "order of operations" will figure prominently in getting the answers correct.

Ms. Amy Ruzicka is Ms. Math Mania. Her "day job" is as a math teacher at St. Gabriel's School in south St. Louis.

She likes to vary the types of math puzzlers she features each month. In November, her Sudoku puzzles turned out to be pretty easy for many of the kids who entered.

We'll see about this month.

For December, Ms. Ruzicka gives a series of six sets of numbers. Your job is to figure out what math functions to use-and in what order-to make all the answers to come out to 24.

That's using addition, subtraction, multiplication, division and parentheses. And be sure you keep in mind the "order of operation" which you use to figure out a range of math questions.

Ms. Math Mania gives you one sample question and answer. But, you might want to use a little bit of advice: Go back to review the order in which you apply different math functions.

For many of you, that would be something you got in 5th grade.

The rules for entering Math Mania remain the same. Each month, YSL.com publishes a number of math brainteasers. We also publish an entry form that can be printed out and the answers filled in.

If you answer all the math puzzles correctly, you'll have a chance to win a Borders book certificate. Depending on the number of correct entries, YSL.com will give from three to five $10 certificates.

To enter the December contest, fill out the attached entry form and give answers to the six "Rule of 24" questions. Be sure to follow instructions when completing the entry form.

In the January edition of YSL.com, we'll publish the answers to these December puzzles and name any winners.

How to enter:

  1. Print out the following entry form.
  2. Fill out your name, address and telephone number.
  3. Answer the six December puzzles.
  4. Put your completed entry into a stamped, addressed envelope.
  5. Be sure to print the entry form so we can be sure of the spelling.
  6. Mail the entry to:

Math Mania Contest
Young Saint Louis.com
813 Rotherham Dr.
Ballwin, Mo. 63011

(All entries must be postmarked by the
15th of the month
to be eligible.)

-----------------------Clip here to make entry form-----------------------

Entry for December 2007, Math Mania Contest:

Name: __________________________________ Age: _____

Address: _________________________ School: ___________

City: _____________________ State: ______ Zip: __________

Contact phone: (_____) _____________________

 

December Math Mania Challenge: 24

The rules of "24" are very simple: Use each of the numbers only once to form an expression that equals 24. You may use addition, subtraction, multiplication, division, and parentheses. Don't forget to follow the order of operations!

Example:

3 5 8 6

Answer:

Good luck and have fun! These problems can be quite perplexing!

1.

 

6 1 2 8.5 Answer:

2.

 

24 12 15 9 Answer:

3.

 

18 18 16 12 Answer:

4.

 

15 9 7 12 Answer:

5.

 

1/2 9 5 1/6 Answer:
6. 5/6 6 6 1/6 Answer:

 

 

 


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