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May answers

Answers for last 2007 Math Mania quiz

There were seven entrants in the final Math Mania contest of 2007-08 who got all five of the Logic Puzzles correct.

With the end of the current school year either at hand or soon to be finished, Ms. Math Mania, Ms. Amy Ruzicka, is going to take a summer vacation like the rest of you.

I'm sure you join with Young Saint Louis.com in thanking her for giving us some math fun during the school year. These puzzles have two advantages over regular math classes: (1) there's no regular grading and (2) you've had a chance to win a Borders book certificate.

With seven all-correct answers, YSL.com is going to award four $10 Border certificates.

The seven kids with all-correct answers were:

Christian Ayala, Colleen Crutsinger, Hannah Frederick, Chris Lamb, Katharine Siemer, Joyce Vlashi and Ryan Wahidi.

And the four randomly-selected certificate winners were:

Colleen Crutsinger, Chris Lamb, Katharine Siemer and Joyce Vlashi.

The answers for the May Math Mania questions were:

May Math Mania Challenge:
Number Logic Puzzles

Use each set of clues to figure out the mystery number.

HELPFUL HINTS:
Before beginning, you may want to brush up on your math vocabulary and divisibility rules!

You may want to list possible solutions and make eliminations as you read through the clues.

Once you think you have solved a puzzle, check your number against ALL of the clues.

Puzzle 1:

  1. It is a three-digit whole number.
  2. Its tens digit is 5.
  3. It is divisible by 4.
  4. It is divisible by 9.
  5. Each of its digits is different.

Answer: 756

Puzzle 2:

  1. It is a three-digit whole number.
  2. It is an odd number.
  3. One of its digits is 7.
  4. It is divisible by 5.
  5. It is less than 700.
  6. It has no even digits.
  7. It is divisible by 3.

Answer: 375

Puzzle 3:

  1. It is a three-digit whole number
  2. Its ones digit is the product of its hundreds digit and its tens digit.
  3. It is an even number.
  4. It has one odd digit.
  5. Its hundreds digit is 4 less than its ones digit.

Answer: 236

Puzzle 4:

  1. It is a three-digit whole number.
  2. It is a prime number.
  3. It is less than 200.
  4. Each of its digits is different.
  5. The sum of its digits is 13.
  6. Its tens digit is greater than its ones digit.

Answer: 193

Puzzle 5:

  1. It is a five-digit whole number.
  2. It is a palindrome.
  3. It has two digits that are 0's.
  4. It is divisible by 5.
  5. It is divisible by 9.

Answer: 50,805

 

 

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