Saturday, September 7, 2013

Mystery Number Questions

Create a mystery number problem using integers.   Use these ideas for developing your clues.  Begin by picking a number between -100 and 100
  • Odd or even?
  • Is it a positive or negative number?
  • Is it a square number
  • Can you name some of the factors?
  • More or less than a number?
Here's an example....

I'm thinking of a number that is less than -10
It is an even number
The number is a multiple of 4 and 9
When you add the absolute value of the digits together you get 9.
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20 comments:

  1. Erik HullSeptember 9, 2013 at 11:28 AM

    The answer to the example mystery number is 36!
    Mr. Hull

    ReplyDelete
  2. UnknownSeptember 9, 2013 at 11:42 AM

    I'm thinking of a number greater than -15
    It's an even number
    It is a multiple of 10 and 2
    The absolute value of the number is 20

    ReplyDelete
    Replies
    1. UnknownSeptember 9, 2013 at 11:50 AM

      is it negative 20

      Delete
    2. Erik HullSeptember 9, 2013 at 8:19 PM

      Since -20 is less than -15, and it has an absolute value of 20, I think that the mystery number is 20.

      Delete
    3. UnknownSeptember 9, 2013 at 10:20 PM

      20 is the correct answer

      Delete
  3. UnknownSeptember 9, 2013 at 11:47 AM

    try answering this one:
    the number is between 20-40
    if you multiply the digits you get 24
    its an even number

    ReplyDelete
  4. UnknownSeptember 9, 2013 at 11:54 AM

    Less than 30
    Divisible by 3
    When you multiply the digits, you get 14
    Less than 30
    Odd Number

    ReplyDelete
  5. Erik HullSeptember 9, 2013 at 11:54 AM

    Place Value - Mystery Numbers
    Karla
    Here's a website where I found some great mystery number problems:)

    http://www.rhlschool.com/math6n2.htm

    1. This mystery number has 4 digits. Every digit is an odd number. None of the digits is a 9. Every digit in the number is different. The smallest digit is in the thousands place. The greatest digit is in the ones place. The preceding describes two possible numbers. The mystery number is the greater of those two numbers. What is the mystery number?

    2. This mystery number has 5 digits. There is a 4 in the ten thousands place. None of the other digits is a 4. What is the smallest number that this mystery number can be?

    3. This mystery number has 6 digits. If you add one to this number it will be a 7 digit number. What is the mystery number?

    4. This mystery number is one half of a billion. How many zeros are in this number?

    ReplyDelete
  6. UnknownSeptember 9, 2013 at 6:33 PM

    When is the next Math blog problem going to be posted???

    ReplyDelete
    Replies
    1. Erik HullSeptember 9, 2013 at 8:16 PM

      Kedus, thanks for your post. The next blog problem will be coming out next week. We'll also have middle school authors share their own problems and post them too. Thanks again:)

      Delete
  7. UnknownSeptember 10, 2013 at 4:48 PM

    I'm thinking of a number that is more than -50
    It's an odd number
    The number is a multiple of 5 and 7
    When you add the absolute value of the digits together, you get 8

    ReplyDelete
  8. UnknownSeptember 11, 2013 at 6:14 PM

    This comment has been removed by the author.

    ReplyDelete
  9. UnknownSeptember 11, 2013 at 6:38 PM

    Correct!!!

    ReplyDelete
    Replies
    1. Erik HullSeptember 12, 2013 at 4:47 PM

      Great question! Could there be more than one possible answer for this one since -35 is also greater than 50? I like the clues you used for your question.

      Delete
    2. UnknownSeptember 13, 2013 at 5:16 PM

      This comment has been removed by the author.

      Delete
  10. UnknownSeptember 13, 2013 at 5:26 PM

    It cant be -35 because the clue said it's a multiple of 7 and 5. And besides, -7 and -5 will give you 35 not -35. And thank you!!

    ReplyDelete

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