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Mystery Number! Learning target: develop number sense and mental math agility Supplies: small white boards Instructions for facilitator: 1. 2. Give students three clues and ask them to figure out the number. For instance: I’m thinking of an odd number between 5 and 15. The number has 2 digits. The two digits are the same. What’s the number? 3. Second round: I’m thinking of an even number between 2 and 12. The number has 1 digit. Half of the number is 3. What’s the number? 4. Third round: I’m thinking of an odd number between 7 and 19. The number has 2 digits. It can be divided into three equal groups. What’s the number? 5. Fourth round: I’m thinking of an even number between 0 and 5. The number has 1 digit. It is a prime number. What’s the number? (You will get a chance to introduce prime numbers on this one.) 6. Fifth round: I’m thinking of an even number between 20 and 30. The number has 2 digits. Half of this number is one dozen. What’s the number? Extensions: 1. 2. 3. Introduce prime and composite numbers to add more clues. Negative numbers would add an interesting element. Use squares and cubes as clues. Submitted by: Carol Eldon