2. Think of a number

3. Think of a number between 10-50 Double it

4. Add 6

5. Take 2

6. Halve the number

7. Take away the number you thought of

8. Write down the number you are left with……. I think the number is…..

9. 2

10. That was clever wasn’t it? Let’s try another one…

11. Think of an even number less than 50.

12. Halve it

13. Add 19

14. Take away 9

15. Double

16. Take away the number you first thought of

17. Write down the number you are left with……. I think the number is…..

18. 20

19. Plenary With a partner, discuss why the think a number puzzles always end up with the same number? Can you make up one of your own?