Use and record a range of mental strategies to solve addition and subtraction problems involving two-digit numbers, including:the jump strategy on an empty number line, the split strategy, eg record how the answer to 37 + 45 was obtained using the split s
| 1. | Which number is 10 less than 16? | |
| 2. | Changing Numbers: 48 to 47 | |
| 3. | Changing Numbers: 27 to 29 | |
| 4. | Changing Numbers: 68 to 58 | |
| 5. | Changing Numbers: 90 to 85 | |
| 6. | Changing Numbers: 66 to 76 | |
| 7. | Number Detectives: 10 + 27 = ? | |
| 8. | Same or Different: Click all the boxes with the answer 25. | |
| 9. | Same or Different: Click all the boxes with the answer 37. | |
| 10. | Same or Different: Click all the boxes with the answer 34. | |
| 11. | Same or Different: Click all the boxes with the answer 26. | |
| 12. | The 20s zone: 22-2=?, 22-5=? | |
| 13. | The 20s zone: 21-1=?, 21-7=? | |
| 14. | The 20s zone: 23-3=?, 23-8=? | |
| 15. | The 20s zone: 25-5=?, 25-8=? | |
| 16. | The 20s zone: 26-6=?, 26-9=? | |
| 17. | The 20s zone: 23-3=?, 20-6=? | |
| 18. | The 20s zone: 24-4=?, 24-6=? | |
| 19. | The 20s zone: 22-2=?, 22-8=? | |
| 20. | The 20s zone: 23-3=?, 23-6=? | |
| 21. | The 20s zone: 27-7=?, 27-9=? | |
| 22. | Beyond 30 - 7 more than 39 | |
| 23. | Beyond 30 - 8 more than 35 | |
| 24. | Beyond 30 - 7 more than 37 | |
| 25. | Beyond 30 - 6 more than 38 |