think of a number think of a number between 10-50 double it

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Think of a number

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Page 1: Think of a number Think of a number between 10-50 Double it

Think of a number

Page 2: Think of a number Think of a number between 10-50 Double it

Think of a number between 10-50

Double it

Page 3: Think of a number Think of a number between 10-50 Double it

Add 6

Page 4: Think of a number Think of a number between 10-50 Double it

Take 2

Page 5: Think of a number Think of a number between 10-50 Double it

Halve the number

Page 6: Think of a number Think of a number between 10-50 Double it

Take away the number you thought of

Page 7: Think of a number Think of a number between 10-50 Double it

Write down the number you are left with…….

I think the number

is…..

Page 8: Think of a number Think of a number between 10-50 Double it

2

Page 9: Think of a number Think of a number between 10-50 Double it

That was clever wasn’t it?

Let’s try another one…

Page 10: Think of a number Think of a number between 10-50 Double it

Think of an even number less than 50.

Page 11: Think of a number Think of a number between 10-50 Double it

Halve it

Page 12: Think of a number Think of a number between 10-50 Double it

Add 19

Page 13: Think of a number Think of a number between 10-50 Double it

Take away 9

Page 14: Think of a number Think of a number between 10-50 Double it

Double

Page 15: Think of a number Think of a number between 10-50 Double it

Take away the number you

first thought of

Page 16: Think of a number Think of a number between 10-50 Double it

Write down the number you are left with…….

I think the number

is…..

Page 17: Think of a number Think of a number between 10-50 Double it

20

Page 18: Think of a number Think of a number between 10-50 Double it

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?

Page 19: Think of a number Think of a number between 10-50 Double it