Select, use and record a variety of mental strategies to solve addition and subtraction problems, including word problems, with numbers of up to four digits
| 1. | Changing Numbers: 324 to 314 | |
| 2. | Changing Numbers: 562 to 662 | |
| 3. | Changing Numbers: 500 to 510 | |
| 4. | Changing Numbers: 444 to 445 | |
| 5. | Same or different? Click all boxes with answer 18 | |
| 6. | Same or Different? Click all boxes with answer 16 | |
| 7. | Addition Chains | |
| 8. | Addition Chains | |
| 9. | Addition Chains | |
| 10. | Addition Chains | |
| 11. | Addition Chains | |
| 12. | Number Detectives: 24 + 6 = ? | |
| 13. | Number Detectives: 5 + 25 = ? | |
| 14. | Addition Chains: 4 + 5 + 6 + 8, 11 + 4 + 3+ 7 | |
| 15. | Number detectives: 22+9 = ? | |
| 16. | Number detectives: 51+11 = ? | |
| 17. | Spot the difference between 30 and 15. | |
| 18. | Spot the difference between 12 and 25. | |
| 19. | Spot the difference between 30 and 10. | |
| 20. | Spot the difference between 40 and 10. | |
| 21. | Spot the difference between 20 and 39. | |
| 22. | Spot the difference between 18 and 25. | |
| 23. | Spot the difference between 25 and 34. | |
| 24. | Spot the difference between 19 and 31. | |
| 25. | Spot the difference between 19 and 42. | |
| 26. | Spot the difference between 36 and 15. | |
| 27. | Spot the difference: 60 & 40, 12 & 18, 100 & 95 | |
| 28. | Spot the difference: 20 & 14, 17 & 9, 80 & 73 | |
| 29. | Spot the difference: 100 & 30, 19 & 11, 30 & 24 | |
| 30. | Spot the difference: 50 & 41, 100 & 92, 101 & 98 | |
| 31. | Big Brother? - working backwards | |
| 32. | The Busy Bus - students on and off bus | |
| 33. | Dr Dan's Number Operations - "x + 2 = 10" | |
| 34. | Who's going to Waterworld? 2+3+3+10 |