Step 4
Difficulty 4
| 1. | Adding tens: 24 + ? = 64, 24 + 50 = ? | |
| 2. | Adding tens: 57 + ? = 97, 57 + 20 = ? | |
| 3. | Number detectives: 25+?, 35+?, 55+? =100 | |
| 4. | Number detectives: 5+?, 45+?, 15+?=100 | |
| 5. | 100 Zone: 70 + 40 = ? 90 + ? = 110, ? + 80 = 110 | |
| 6. | 100 Zone: 60 + 80 = ? 90 + ? = 140, ? + 100 = 140 | |
| 7. | 100 Zone: 70 + 80 = ? 100 + ? = 150, ? + 70 = 150 | |
| 8. | 100 Zone: 90 + 70 = ? 80 + ? = 160, ? + 60 = 160 | |
| 9. | Add it up: 58+34 | |
| 10. | Number detectives 485+*= 493 | |
| 11. | Number detectives 515+*= 523 | |
| 12. | Make 200: 130+50+* | |
| 13. | Make 200: 70+100+* | |
| 14. | Make 200: 60+40+* | |
| 15. | Make 200: 90+30+* | |
| 16. | Make 200: 150+40+* | |
| 17. | Add It Up: Addition with regrouping 15+28 | |
| 18. | Add It Up: Addition with regrouping 29+16 | |
| 19. | Add It Up: Addition with regrouping 22+29 | |
| 20. | Add It Up: Addition with regrouping 54+28 | |
| 21. | Add It Up: Addition with regrouping 67+27 | |
| 22. | Number Detectives: 100 Pairs ? + 79 = 100 | |
| 23. | Number Detectives: 100 Pairs ? + 51 = 100 | |
| 24. | Number Detectives: 100 Pairs 63 + 37 = ? | |
| 25. | Number Detectives: 100 Pairs 88 + ? = 100 | |
| 26. | On the Board 45 + 3* = *7 | |
| 27. | On the Board 3* + *5 = 98 | |
| 28. | On the Board 4* + 42 = *9 | |
| 29. | On the Board 3* + 62 = *6 | |
| 30. | On the Board 8* + *6 = 98 | |
| 31. | On the Board 63 + 32 = ** | |
| 32. | On the Board 33 + *5 = 7* | |
| 33. | On the Board 63 + 17 = ** | |
| 34. | Add Hundreds: 600+ * = 946 | |
| 35. | Add Hundreds: 200+ * = 580 | |
| 36. | Add Hundreds: 400+ * = 963 | |
| 37. | Add Hundreds: 100+ * = 319 | |
| 38. | Add Hundreds: 300+ * = 565 | |
| 39. | Double up & add: Double 12, + 4, + 10 | |
| 40. | Double up & add: Double 13, + 3, + 10 | |
| 41. | Double up & add: Double 13, + 2, + 10 | |
| 42. | Add Hundreds: 500+246 | |
| 43. | Add Hundreds: 300+453 | |
| 44. | Add Hundreds: 800+163 | |
| 45. | Add Hundreds: * + 300 = 330 | |
| 46. | Add Hundreds: * + 200 = 241 | |
| 47. | Add Hundreds: * + 800 = 819 | |
| 48. | Add Hundreds: * + 300 = 345 | |
| 49. | Add Hundreds: * + 200 = 295 | |
| 50. | Bargain basement: $18+$6+$8 | |
| 51. | Bargain basement: $16+$6+$20 | |
| 52. | Bargain basement: $48+$6+$5 | |
| 53. | Add It Up: Addition with regrouping 63 + 27 | |
| 54. | Add It Up: Addition with regrouping 34 + 57 | |
| 55. | Add It Up: Addition with regrouping 34 + 57 | |
| 56. | Add It Up: Addition with regrouping 55 + 25 | |
| 57. | Add It Up: Addition with regrouping 28 + 43 | |
| 58. | True or False? 10-7=20-7 | |
| 59. | True or False? 15-2=2-15 | |
| 60. | True or False? 10-2=11-3 | |
| 61. | True or False? 9-5=8-4 | |
| 62. | Take it away: Subtraction with decomposition 63-9 | |
| 63. | Take it away: Subtraction with decomposition 51-5 | |
| 64. | Take it away: Subtraction with decomposition 34-8 | |
| 65. | Take it away: Subtraction with decomposition 41-6 | |
| 66. | Take it away: Subtraction with decomposition 63-9 | |
| 67. | Take it away: Subtraction with decomposition 45-7 | |
| 68. | Take it away: Subtraction with decomposition 56-9 | |
| 69. | Take it away: Subtraction with decomposition 45-9 | |
| 70. | True or False?: 12 - 2 = 15 - 5 | |
| 71. | True or False?: 28 - 8 = 30 - 10 | |
| 72. | True or False?: 25 - 5 = 25 - 5 | |
| 73. | True or False?: 15 - 5 = 30 - 20 | |
| 74. | True or False?: 30 - 5 = 28 - 3 | |
| 75. | Take it away: Subtraction with decomposition 52 - 36 | |
| 76. | Take it away: Subtraction with decomposition 43 - 26 | |
| 77. | Take it away: Subtraction with decomposition 46 - 28 | |
| 78. | Take it away: Subtraction with decomposition 71 - 52 | |
| 79. | Eleven family: Subtract 1, 11 & 21 from 5 | |
| 80. | Eleven family: Subtract 1, 11 & 31 from 77 | |
| 81. | Eleven family: Subtract 1, 11 & 71 from 96 | |
| 82. | Anyone for a burger?: $20 - ($6 + $6 + $1 + $3) | |
| 83. | Anyone for a burger?: $20 - ($4 + $4 + $1 + $3) | |
| 84. | Changing Numbers 84 to 63 | |
| 85. | Changing Numbers 100 to 44 | |
| 86. | Changing Numbers 40 to 24 | |
| 87. | Changing Numbers 124 to 98 | |
| 88. | Write the missing number: 35 + 9 + ? = 50 | |
| 89. | Write the missing number: 35 + 13 + ? = 50 | |
| 90. | Write the missing number: 35 + 11 + ? = 50 | |
| 91. | True or False: 200 - 28 = 172 | |
| 92. | True or False: 30 + 16 - 4 = 44 | |
| 93. | True or False: 30 + 16 - 4 = 42 | |
| 94. | True or False: 30 + 16 - 4 = 46 | |
| 95. | Hundreds takeaway 697-**=614 | |
| 96. | Hundreds takeaway 457-**=425 | |
| 97. | Hundreds takeaway 596-**=543 | |
| 98. | Hundreds takeaway 997-**=971 | |
| 99. | Subtracting tens: 86 - ? = 56 | |
| 100. | Subtracting tens: 94 - ? = 24 | |
| 101. | Loraine's day out: $50 < or > ($22 + $18)? | |
| 102. | Jamie's day out: $20 < or > ($12 + $12)? | |
| 103. | Wendy's day out: $50 < or > ($34 + $14)? | |
| 104. | Spot the Difference: Between 169 and 176 | |
| 105. | Spot the Difference: Between 239 and 242 | |
| 106. | Spot the Difference: Between 465 and 472 | |
| 107. | Spot the Difference: Between 327 and 333 | |
| 108. | Spot the Difference: Between 689 and 694 | |
| 109. | Spot the difference: 160 and 174; 346 and 360; 190 and 204 | |
| 110. | The Chicken Story: seventy-seven + twelve | |
| 111. | The Chicken Story: thirty-nine + twelve | |
| 112. | The Chicken Story: forty-one + seventeen |