Step 1
Difficulty 1
| 1. | Make 400: 200+100+? | |
| 2. | Make 500: 100+200+? | |
| 3. | Make 600: 50+550+? | |
| 4. | Make 800: 125+225+? | |
| 5. | Make 900: 275+375+? | |
| 6. | Same or different: Click all the boxes with the same answer. | |
| 7. | Same or different: Click all the boxes with the same answer. | |
| 8. | True or False?: 26+46=72 13+29=44 62+18=80 38+25=53 | |
| 9. | True or False?: 27+18=45 32+39=49 49+27=76 57+26=83 | |
| 10. | True or False?: 19+49=58 48+33=81 24+37=62 64+28=90 | |
| 11. | Number Detectives: Mystery Teens | |
| 12. | Number Detectives: Mystery Teens | |
| 13. | Number Detectives: Mystery Teens | |
| 14. | Number Detectives: Mystery Teens | |
| 15. | Add it up: 347+454 | |
| 16. | Add it up: 627+277 | |
| 17. | Add it up: 7239+697 | |
| 18. | Write the missing number: 750+100+?=1000 | |
| 19. | Write the missing number: 600+50+?=1000 | |
| 20. | Write the missing number: 500+450+?=1000 | |
| 21. | Write the missing number: 250+50+?=1000 | |
| 22. | Write the missing number: 650+100+?=1000 | |
| 23. | True or False?: 50-5=90-45 | |
| 24. | True or False?: 36-7=20-8 | |
| 25. | True or False?: 35-15=40-20 | |
| 26. | Hundreds Takeaway: 658 - *79 = 1*9 | |
| 27. | Hundreds Takeaway: 9*1 - *52 = 1*9 | |
| 28. | Hundreds Takeaway: **1 - 21* = 185 | |
| 29. | Mysteries of 50!: 50-?=46, 36, 26 | |
| 30. | Mysteries of 60!: 60-?=35, 30, 45 | |
| 31. | Mysteries of 60!: 60-?=40, 30, 20 | |
| 32. | Mysteries of 60!: 60-?=32, 28, 16 | |
| 33. | Mysteries of 50!: 50-?=17, 28, 39 | |
| 34. | Mysteries of 50!: 50-?=33, 8, 24 | |
| 35. | Mysteries of 50!: 50-?=34, 25, 14 | |
| 36. | Mysteries of 70!: 70-?=44, 38, 29 | |
| 37. | Mysteries of 70!: 70-?=58, 33, 9 | |
| 38. | Mysteries of 70!: 70-?=28, 35, 43 | |
| 39. | Subtraction Chains | |
| 40. | Subtraction Chains | |
| 41. | Subtraction Chains | |
| 42. | Subtraction Chains | |
| 43. | Subtraction Chains | |
| 44. | Subtraction Chains | |
| 45. | Subtraction Chains | |
| 46. | Subtraction Chains | |
| 47. | Subtraction Chains | |
| 48. | Take it away: 422 - 114 = ? | |
| 49. | Take it away: 650 - 322 = ? | |
| 50. | Take it away: 456 - 245 = ? | |
| 51. | Take it away: 763 - 335 = ? | |
| 52. | Take it away: 389 - 147 = ? | |
| 53. | Same or different: Click all the boxes with the same answer. | |
| 54. | Same or different: Click all the boxes with the same answer. | |
| 55. | Same or different: Click all the boxes with the same answer. | |
| 56. | Duncan at the sweet shop: $10-($1+$2+$1.20+$1.20) |