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 by by Fiona Campbell City of Bristol College.
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 by by Fiona Campbell City of Bristol College.

2. Think of a Number A bit of maths magic?
Kindly contributed to by by Fiona Campbell City of Bristol College.
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)

3. Think of a number between 1 and 10

4. Add 1

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

8. Plus 5

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

12. Add eight

13. Subtract 9

14. Subtract the number you first thought of

15. 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?