Mystery Number

Students will be creating mystery numbers containing 5 to 7 digits.  This project will be part of their math unit in number sense.  You can play a game like this at home.  All you need is a set of digit cards with the digits 0-9 or a deck of playing cards with the face cards removed.  The first player shuffles the cards and then lays out five cards in a row in a place where the other players cannot see them.  The first player then gives clues to the others.  Whoever guesses the mystery number first wins and hides the next number.
What kind of clues to do you give?  Here's an example:

"I have a 5-digit number.
There is an 8 in the ten thousands' place.
The hundreds' place is half of the thousands' place.
There is a 2 in the thousands' place.
The tens' place is the product of 2 x 2.
The ones' place has one less than the tens' place.
What is my mystery number?"

82 143