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Think of a Number PowerPoint PPT Presentation


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Think of a Number. N1/E2.3 Add and subtract two-digit whole numbers N1/E2.4 Recall addition and subtraction facts to 10. N1/E3.3 Recall addition and subtraction facts to 20 (but makes a good warm activity for any level).

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Think of a Number

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Think of a Number

N1/E2.3 Add and subtract two-digit whole numbers

N1/E2.4 Recall addition and subtraction facts to 10. N1/E3.3 Recall addition and subtraction facts to 20

(but makes a good warm activity for any level)

Kindly contributed to www.skillsworkshop.org by by Fiona Campbell fiona.campbell@cityofbristol.ac.uk City of Bristol College.


Think of a Number

A bit of maths magic?


Think of a number between 1 and 10


Add 1


Double the result Hint: to double you by what?


Plus 5


Halve the result [Hint to halve something you divide by what?] …. Still not sure - then ask another student!


Add eight


Subtract 9


Subtract the number you first thought of


Your answer is 1

Try starting again with another number. Does it work for all numbers? Use big numbers and a calculator. How does it work?


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