Secret Numbers is a great game to play in the car, on a plane or at any time for that matter! Here's how it works, pick a number and give clues about your number. For each guess a child has, provide the next clue.

*Here is an example:*

- I'm thinking of a number that is not a multiple of 4
- My secret number is not an even number
- My secret number is not a multiple of 7
- My secret number is not a multiple of 9
- The sum of its digits is less than 11
- My number is not a multiple of 3

What is my secret number? Of course, you could add a clue that would be a dead give away, the sum of the digits of my secret number is 2. *(Of course, my secret number is 11.) *

For more great games involving math on the go (in a car, on a plane, while waiting for appointments), check out this article.

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