Applying their increasing knowledge of mental and written methods
| 1. | Number Detectives: 10 + 20 = ? | |
| 2. | Subtract from 100: 100 - 30, 40 & 20 | |
| 3. | Subtract from 100: 100 - 20, 30 & 70 | |
| 4. | Subtract from 100: 100 - 70, 20 & 40 | |
| 5. | Subtract from 100: 100 - 40, 90 & 50 | |
| 6. | Subtract from 100: 100 - 60, 20 & 100 | |
| 7. | Same Difference - Difference between 10 and 40. | |
| 8. | Build A Total - number sequence, 24 | |
| 9. | Build a Total - number sequence, 15 | |
| 10. | Who's going to Waterworld? 2+4+3+3 |