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Think of a number

Think of a number. Think of a number between 10-50. Double it. Add 6. Take 2. Halve the number. Take away the number you thought of. Write down the number you are left with……. I think the number is…. 2. That was clever wasn’t it?. Let’s try another one….

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Think of a number

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  1. Think of a number

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

  3. Add 6

  4. Take 2

  5. Halve the number

  6. Take away the number you thought of

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

  8. 2

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

  10. Think of an even number less than 50.

  11. Halve it

  12. Add 19

  13. Take away 9

  14. Double

  15. Take away the number you first thought of

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

  17. 20

  18. 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?

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