Step 4
Difficulty 4
| 1. | Add these 3 numbers: 14 + 5 + 2 | |
| 2. | Add these 3 numbers: 11 + 4 + 5 | |
| 3. | Add these 3 numbers: 13 + 7 + 6 | |
| 4. | Adding tens: 38 + 20 = ? | |
| 5. | Adding tens: 56 + 30 = ? | |
| 6. | Now Add This! 34+11, 34+12 | |
| 7. | Now Add This! 33+19, 33+21 | |
| 8. | Add three numbers: 14 + 7 + 3 | |
| 9. | Add three numbers: 10 + 12 + 8 | |
| 10. | Make 36: 20 + 14 + ? | |
| 11. | Make 39: 30 + 6 + ? | |
| 12. | Make 37: 12 + 20 + 5 | |
| 13. | Number detectives: 30+?, 50+?, 60+? =100 | |
| 14. | Add three numbers: 2 + 13 + 9 | |
| 15. | Add three numbers: 15 + 7 + 8 | |
| 16. | Add three numbers: 17 + 7 + 12 | |
| 17. | Number detectives: ? + 9 = 49 | |
| 18. | Number detectives: ? + 11 = 53 | |
| 19. | Crossing 100: 4 more than 99 | |
| 20. | Crossing 100: 7 more than 97 | |
| 21. | Crossing 100: 8 more than 98 | |
| 22. | Crossing 100: 9 more than 92 | |
| 23. | Crossing 100: 5 more than 97 | |
| 24. | True or False: 12+14=26 | |
| 25. | True or False: 12+12=24 | |
| 26. | True or False: 13+14=28 | |
| 27. | True or False: 15+12=27 | |
| 28. | True or False: 16+11=25 | |
| 29. | Same or Different: Click all the boxes with the answer 50. | |
| 30. | Same or Different: Click all the boxes with the answer 46. | |
| 31. | Same or Different: Click all the boxes with the answer 32. | |
| 32. | Same or Different: Click all the boxes with the answer 45. | |
| 33. | Same or Different: Click all the boxes with the answer 38. | |
| 34. | Make 50: 39+7+? = 50 | |
| 35. | Make 50: 39+5+? = 50 | |
| 36. | Make 50: 35+5+? = 50 | |
| 37. | Make 50: 38+10+? = 50 | |
| 38. | Make 50: 42+6+? = 50 | |
| 39. | Beyond 70: 5 more than 79 | |
| 40. | Beyond 70: 9 more than 72 | |
| 41. | 36 + 12 = 48 So what else is true? | |
| 42. | Add board 5* + 46 = *8 | |
| 43. | Add board 35 + *3 = 7* | |
| 44. | Same or different:19-12,2+5,3+4,33-26,16-8 | |
| 45. | Use the pattern: 10, 20 & 80 - 5 = ? | |
| 46. | Use the pattern: 10, 20 & 40 - 3 = ? | |
| 47. | Use the pattern: 10, 20 & 90 - 7 = ? | |
| 48. | Use the pattern: 10, 20 & 50 - 4 = ? | |
| 49. | Use the pattern: 10, 20 & 30 - 8 = ? | |
| 50. | Mysteries of Fifty: 50-?=48, 50-?=43 | |
| 51. | Mysteries of Fifty: 50-?=44, 50-?=47 | |
| 52. | Use the pattern 13-6=? 23-6=?, 33-6=? | |
| 53. | Use the pattern 12-9=? 22-9=?, 32-9=? | |
| 54. | Use the pattern 19-4=? 29-4=?, 39-4=? | |
| 55. | The 9 family: Take 9, 19 & 29 from 57 | |
| 56. | Spot the difference between 20 and 39. | |
| 57. | Spot the difference between 18 and 25. | |
| 58. | Spot the difference between 25 and 34. | |
| 59. | Spot the difference between 19 and 31. | |
| 60. | Spot the difference between 19 and 42. | |
| 61. | Spot the difference between 36 and 15. | |
| 62. | Write the missing number: 20 + 3 + ? = 30 | |
| 63. | Write the missing number: 12 + ? + 10 = 30 | |
| 64. | Write the missing number: 15 + ? + 5 = 30 | |
| 65. | Write the missing number: 9 + ? + 12 = 30 | |
| 66. | Write the missing number: ? + 5 + 4 = 30 | |
| 67. | Write the missing number: 15 + ? + 6 = 30 | |
| 68. | Write the missing number: 20 + 3 + ? = 30 | |
| 69. | Number detectives: 30 - ? = 15 | |
| 70. | Number detectives: 30 - ? = 13 | |
| 71. | Taking Tens: 98 - 50 | |
| 72. | Taking Tens: 32 - 20 | |
| 73. | Taking Tens: 59 - 40 | |
| 74. | Taking Tens: 87 - 20 | |
| 75. | Taking Tens: 72 - 40 | |
| 76. | Subtract.chains 48 - 7 - 2 - 9, 35 - 4 - 3 - 8 | |
| 77. | Spot the difference: 50 & 41, 100 & 92, 101 & 98 | |
| 78. | Subtraction chains 80-6-5-3, 70-4-2-5 | |
| 79. | Subtraction chains 30-9-2-5, 60-5-4-3 | |
| 80. | Subtraction chains 40-5-6-3, 50-9-2-8 | |
| 81. | Subtraction chains 90-3-5-3, 40-2-8-5 | |
| 82. | Subtraction chains 60-9-2-3, 50-3-6-10 | |
| 83. | 19 go to Waterworld: 5+4+3+? | |
| 84. | Make 50: 32+8+? = 50 | |
| 85. | Andrew at the shop: 50c - 25c | |
| 86. | Madeline at the shop: 50c - 5c | |
| 87. | Gavin at the shop: 60c + 10c | |
| 88. | Damien at the shop: 10c + 5c | |
| 89. | Jenny at the shop: 60c + 30c | |
| 90. | Sarah at the shop: 50c + 40c |