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Think of a Number

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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  1. 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.

  2. Think of a Number A bit of maths magic?

  3. Think of a number between 1 and 10

  4. Add 1

  5. Double the result Hint: to double you by what?

  6. Plus 5

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

  8. Add eight

  9. Subtract 9

  10. Subtract the number you first thought of

  11. 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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