1. DOUBLE AND HALF

5. Four is too little.
double

6. 8 is too many.
half

7. half
double

8. ？ ？ 1 2 4 3 5 6 7 8 9 10 6 10 12 14 16 18 20 fill in the blanks: half
double

9. 1 2 3 5 6 7 8 9 10 4 12 14 16 18 20
half
double
even numbers

10. E1: fill the blanks 8 16 7 5 5 8 16 14 5 4 8 7 5

11. Buy one get two
50% discount
double
half

12. double
double
double

13. half 8
half 4 10
half 5
half 7 14

14. E2: fill the blanks 4 7 10 20 20 4 4 3 5

15. E3: fill the blanks 6 12 6 3 10 5

16. Can you find double and half?4 1 8 2 4 2
double
double
double 8 1 4

17. Summary:
Double and half