Step 1
Difficulty 1
| 1. | Make 150 70+44+* | |
| 2. | Make 120 52+37+* | |
| 3. | Make 140 96+14+* | |
| 4. | Make 130 75+41+* | |
| 5. | Make 160 57+33+* | |
| 6. | T/F double sided: 56+14=35+35, etc | |
| 7. | T/F double sided: 23+12=65+30, etc | |
| 8. | T/F double sided: 21+80=92-42, etc | |
| 9. | T/F double sided: 42+46=19+69 | |
| 10. | T/F double sided: 32+18=25+25 | |
| 11. | Give or Take 10 000 40000+227558 | |
| 12. | Give or Take 10 000 50 000+23 565 | |
| 13. | Give or Take 10 000 40 000+56 780 | |
| 14. | Give or Take 10 000 20 000 + 239 330 | |
| 15. | Give or Take 10 000 50 000+50 332 | |
| 16. | Number detectives: Add 4 clustered tens numbers | |
| 17. | Number detectives: Add 4 clustered tens numbers | |
| 18. | Number detectives: Add 4 clustered tens numbers | |
| 19. | Number detectives: Add 4 clustered tens numbers | |
| 20. | Number detectives: Add 4 clustered tens numbers | |
| 21. | Negative Thinking 2 + * = -4 | |
| 22. | Adding the big ones: Write the missing numbers in vertical addition of large whole numbers | |
| 23. | Adding the big ones: Write the missing numbers in vertical addition of large whole numbers | |
| 24. | Squaring up Sq.root of (a + b ) = sq.root (a) + sq.rt (b) T/F | |
| 25. | True or False: 456-78=379 | |
| 26. | True or False: 631-82=549 | |
| 27. | True or False: 297=342-45 | |
| 28. | True or False: 186=237-52 | |
| 29. | True or False: 746-53=693 | |
| 30. | Same or Different - Click all the boxes where the answer is 84 | |
| 31. | Same or Different - Click all the boxes where the answer is 387 | |
| 32. | Same or Different - Click all the boxes where the answer is 792 | |
| 33. | Same or Different - Click all the boxes where the answer is 576 | |
| 34. | Same or Different - Click all the boxes where the answer is 264 | |
| 35. | Complementary add/sub: 8236-547=7689 | |
| 36. | Complementary add/sub: 2815-492=2323 | |
| 37. | Complementary add/sub: 5730-166=5564 | |
| 38. | Complementary add/sub: 1073-561=512 | |
| 39. | Complementary add/sub: 6923-784=6139 | |
| 40. | Give or Take a Hundred 562719-500 | |
| 41. | Give or Take a Hundred 276582-400 | |
| 42. | Give or Take a Hundred 618395-200 | |
| 43. | Give or Take a Hundred 45927-300 | |
| 44. | Give or Take a Hundred 75881-700 | |
| 45. | Taking the Big Ones: Write the missing numbers in vertical subtractions | |
| 46. | Taking the Big Ones: Write the missing numbers in vertical subtractions | |
| 47. | Driven to the edge: 1000-793 | |
| 48. | Growing pains - 1000-126 | |
| 49. | Pump up the volume - 3000-934 | |
| 50. | Taking stock - 1000-750 | |
| 51. | Thousands crossing: Add/subtract crossing a thousands bound | |
| 52. | Thousands crossing: Add/subtract crossing a thousands bound | |
| 53. | Thousands crossing: Add/subtract crossing a thousands bound | |
| 54. | Thousands crossing: Add/subtract crossing a thousands bound | |
| 55. | Thousands crossing: Add/subtract crossing a thousands bound |