1. Doubling and Halving

2. Double Halve This means to add the same number on again to make it twice as big. This means to split the number into two equal groups.

3. 12 6 out in

4. 20 10 out in

5. 16 8 out in

6. 10 5 out in

7. 14 7 out in

8. 12 6 out in

9. 16 8 out in

10. 20 10 out in

11. 18 9 out in

12. 14 7 out in