The "C" Branch

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A Fun Math Riddle

Posted by Chris DeMarco on Monday, July 23rd, 2007 at 10:12 pm

I hope everyone’s having a great summer, and spending plenty of time outside! This is, of course, why there haven’t been too many posts lately. But, just to break up the monotony, here’s a fun riddle I came up with:

How many two digit numbers less than 25, that end in four, are there?

Good luck!

Oh, and I figured out how to open up commenting so you can leave your guesses. I’ll reveal the answer next week.

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8 Responses to “A Fun Math Riddle”

  1. Tom Says:

    Well…..the obvious answer is 9.

  2. Chris DeMarco Says:

    You’re close, Tom! Try again.

  3. Tom Says:

    lol, i meant 10

  4. Tom Says:

    lolz again, i meant 11

  5. Chris DeMarco Says:

    You’re right!

    For all of you who are wondering why that is the answer, here you are. There are 11 numbers:

    -94, -84, -74. -64, -54, -44, -34, -24, -14, 14, 24

  6. Ben Lauer Says:

    sorry, just stumbled across this…but what about decimals, eh? they’re technically 2 digits…right?
    -94, -84, -74. -64, -54, -44, -34, -24, -14, -9.4, -8.4, -7.4, -6.4, -5.4, -4.4, -3.4, -2.4, -1.4, 1.4, 2.4, 3.4, 4.4, 5.4, 6.4, 7.4, 8.4, 9.4, 14, 24

  7. Chris DeMarco Says:

    I guess you kinda have a good point there, Ben…great thinking! Obviously I meant whole numbers, so if I ever use this riddle again, I’ll be sure to add that in there. Thanks!

  8. MovGP0 Says:

    Well, the number of two-digit numbers that end with the digit 4 depends heavily on your number system:

    * Real Numbers: 2,4
    * Rational Numbers: 2/4
    * Natural Numbers: no negative numbers
    * Hex: -A4
    * Octal: there is no -84, -94

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