2.OA.1
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.1
| 1. | Changing numbers: 36 to 39 | |
| 2. | Changing Numbers: 24 to 21 | |
| 3. | Changing Numbers: 66 to 76 | |
| 4. | Changing Numbers: 80 to 78 | |
| 5. | Changing Numbers: 50 to 45 | |
| 6. | Changing Numbers: 35 to 40 | |
| 7. | Changing Numbers: 48 to 47 | |
| 8. | Changing Numbers: 27 to 29 | |
| 9. | Changing Numbers: 68 to 58 | |
| 10. | Changing Numbers: 90 to 85 | |
| 11. | Changing Numbers: 66 to 76 | |
| 12. | Changing Numbers: 10 to 15 | |
| 13. | Changing Numbers: 20 to 30 | |
| 14. | Changing Numbers: 45 to 35 | |
| 15. | Changing Numbers: 90 to 100 | |
| 16. | Changing Numbers: 85 to 80 | |
| 17. | Changing Numbers: 45 to 50 | |
| 18. | Changing Numbers: 99 to 100 | |
| 19. | Changing Numbers: 24 to 14 | |
| 20. | Changing Numbers: 85 to 80 | |
| 21. | Changing Numbers: 48 to 50 | |
| 22. | Changing Numbers: 324 to 314 | |
| 23. | Changing Numbers: 562 to 662 | |
| 24. | Changing Numbers: 500 to 510 | |
| 25. | Changing Numbers: 444 to 445 | |
| 26. | Changing Numbers: 100 to 200 | |
| 27. | Changing Numbers: 265 to 255 | |
| 28. | Changing Numbers: 550 to 650 | |
| 29. | Changing Numbers: 300 to 299 | |
| 30. | Changing Numbers: 888 to 898 | |
| 31. | Changing Numbers: 428 to 438 | |
| 32. | Changing Numbers: 204 to 194 | |
| 33. | Changing Numbers: 402 to 412 | |
| 34. | Changing Numbers: 399 to 499 | |
| 35. | True or False? 2+8 = 8+2 | |
| 36. | Changing Numbers: 24 to 34 | |
| 37. | Changing Numbers: 25 to 26 | |
| 38. | Changing Numbers: 17 to 21 | |
| 39. | Changing Numbers: 10 to 21 | |
| 40. | Changing Numbers: 17 to 21 | |
| 41. | Changing Numbers: 18 to 21 | |
| 42. | Who's going to Waterworld? 5+4+3+2 | |
| 43. | Changing Numbers: 27 to 31 | |
| 44. | Changing Numbers: 24 to 28 | |
| 45. | Changing Numbers: 29 to 39 | |
| 46. | Changing Numbers: 30 to 50 | |
| 47. | Changing Numbers: 48 to 50 | |
| 48. | True or False?: 10 + 5 = 5 + 10 | |
| 49. | True or False?: 4 + 14 = 10 + 4 | |
| 50. | True or False?: 21 + 4 = 25 | |
| 51. | True or False?: 23 + 2 = 27 | |
| 52. | True or False?: 26 + 3 = 29 | |
| 53. | True or False?: 24 + 4 = 25 | |
| 54. | True or False?: 22 + 6 = 28 | |
| 55. | Same or Different? Click all boxes with answer 20 | |
| 56. | Make 19: 8+6+? | |
| 57. | Make 18: 4+11+? | |
| 58. | Make 20: 9+11+? | |
| 59. | Make 20: 9+6+? | |
| 60. | True or False?: 18 + 2 = 20 | |
| 61. | True or False?: 9 + 8 = 10 | |
| 62. | True or False?: 42 + 7 = 49 | |
| 63. | True or False?: 53 + 2 = 60 | |
| 64. | True or False?: 7 + 8 = 15 | |
| 65. | Same or Different: Click all the boxes with the answer 25. | |
| 66. | Same or Different: Click all the boxes with the answer 37. | |
| 67. | Same or Different: Click all the boxes with the answer 34. | |
| 68. | Same or Different: Click all the boxes with the answer 26. | |
| 69. | Same or Different: Click all the boxes with the answer 28. | |
| 70. | Make 30: 20 + 7 + ? = 30 | |
| 71. | True or False?: 17 + 4 = 20 | |
| 72. | True or False?: 8 + 8 = 16 | |
| 73. | True or False?: 9 + 8 = 16 | |
| 74. | True or False?: 15 + 5 = 20 | |
| 75. | True or False?: 5 + 6 = 12 | |
| 76. | True or False?: 16 + 3 = 18 | |
| 77. | True or False?: 7 + 9 = 16 | |
| 78. | True or False?: 13 + 1 = 1 + 13 | |
| 79. | True or False?: 16 + 4 = 20 | |
| 80. | True or False?: 9 + 7 = 17 | |
| 81. | True or False: 7+8=12 | |
| 82. | True or False: 17+2=20 | |
| 83. | True or False: 10+9=19 | |
| 84. | True or False: 22+4=23 | |
| 85. | True or False: 9+6=15 | |
| 86. | True or False? 10-5=20-5 | |
| 87. | Card games: Which is lower, 4 + 2 or 6 + 1? | |
| 88. | Card games: Which is lower, 7 + 3 or 5 + 4? | |
| 89. | Card games: Which is lower, 6 + 4 or 2 + 3? | |
| 90. | Card games: Which is lower, 4 + 3 or 1 + 9? | |
| 91. | Card games: Which is higher, 4 + 5 or 5 + 1? | |
| 92. | Write the missing number: 15 + 1 + ? = 20 | |
| 93. | Write the missing number: ? + 11 + 2 = 20 | |
| 94. | Write the missing number: 3 + 4 + ? = 20 | |
| 95. | Write the missing number: ? + 5 + 6 = 20 | |
| 96. | Write the missing number: 5 + 8 + ? = 20 | |
| 97. | Write the missing number: 4 + 8 + ? = 20 | |
| 98. | Write the missing number: ? + 13 + 4 = 20 | |
| 99. | Write the missing number: 4 + ? + 6 = 20 | |
| 100. | Write the missing number: 8 + ? + 7 = 20 | |
| 101. | Write the missing number: 6 + ? + 8 = 20 | |
| 102. | Write the missing number: ? + 9 + 6 = 20 | |
| 103. | Write the missing number: 2 + 11 = ? = 20 | |
| 104. | Write the missing number: ? + 7 + 9 = 20 | |
| 105. | Hide and seek: 10 trolls - 5 | |
| 106. | Hide and seek: 14 trolls - 5 | |
| 107. | Hide and seek: 11 trolls - 5 | |
| 108. | Write in the missing number: ? + 13 + 5 = 21 | |
| 109. | True or False?: 29 - 7 = 23 | |
| 110. | True or False?: 28 - 5 = 21 | |
| 111. | True or False?: 24 - 2 = 20 | |
| 112. | True or False?: 12 - 6 = 6 | |
| 113. | True or False?: 9 - 4 = 5 | |
| 114. | True or False?: 17 - 2 = 15 | |
| 115. | True or False?: 15 - 3 = 10 | |
| 116. | True or False?: 8 - 5 = 2 | |
| 117. | True or False?: 27 - 4 = 23 | |
| 118. | True or False?: 25 - 5 = 20 | |
| 119. | Subtraction Chain - 27-20-13 | |
| 120. | Subtraction Chain - ?-4=21-2=19 | |
| 121. | Subtraction Chain - 27-4=?-6=17 | |
| 122. | Subtraction Chain - 28-7=21-5=? | |
| 123. | True or False?: 16 - 8 = 8 | |
| 124. | True or False?: 23 - 5 = 18 | |
| 125. | True or False?: 21 - 16 = 4 | |
| 126. | True or False?: 18 - 9 = 8 | |
| 127. | True or False?: 19 - 6 = 12 | |
| 128. | True or False?: 24 - 15 = 8 | |
| 129. | True or False?: 16 - 9 = 7 | |
| 130. | True or False?: 22 - 10 = 11 | |
| 131. | True or False?: 19 - 13 = 6 | |
| 132. | True or False?: 26 - 13 = 13 | |
| 133. | True or False?: 30 - 8 = 22 | |
| 134. | True or False?: 30 - 25 = 20 | |
| 135. | True or False?: 30 - 10 = 20 | |
| 136. | True or False?: 30 - 10 = 15 | |
| 137. | True or False?: 30 - 7 = 23 | |
| 138. | Build A Total - number sequence, 15 | |
| 139. | Card games: 6 + 4 = ?, 2 + 3 = ? | |
| 140. | Card games: 7 + 4 = ?, 9 + 8 = ? | |
| 141. | Card games: 7 + 9 = ?, 8 + 3 = ? | |
| 142. | Card games: 5 + 8 = ?, 7 + 9 = ? | |
| 143. | Card games: 9 + 9 = ?, 8 + 6 = ? | |
| 144. | Who's going to Waterworld? 2+4+3+8 | |
| 145. | Who's going to Waterworld? 4+4+2+5 | |
| 146. | Who's going to Waterworld? 2+3+3+10 | |
| 147. | Who's going to Waterworld? 7+3+2+3 | |
| 148. | Who's going to Waterworld? 5+4+5+3 | |
| 149. | The Chicken Story: sixty + eleven | |
| 150. | The Chicken Story: seventy-four - sixty-seven | |
| 151. | The Chicken Story: forty-four - thirty-four | |
| 152. | The Chicken Story: twenty-eight - twenty | |
| 153. | The Chicken Story: fifty - forty-six | |
| 154. | The Chicken Story: thirty - twenty-five | |
| 155. | The Chicken Story: thirty-seven - thirty-four | |
| 156. | The Chicken Story: twenty-four - twenty | |
| 157. | 16 go to WaterWorld: 5+4+3+? | |
| 158. | 17 go to Waterworld: 6+5+2+? | |
| 159. | 14 go to Waterworld: 6+3+2+? | |
| 160. | 18 go to WaterWorld: 3+3+2+? | |
| 161. | 15 go to WaterWorld: 5+3+2+? | |
| 162. | 16 go to Waterworld? 2+3+3+? | |
| 163. | Card games: Which is higher, 5 + 4 or 3 + 7? | |
| 164. | Card games: Which is higher, 3 + 5 or 4 + 8? | |
| 165. | Card games: Which is higher, 5 + 9 or 6 + 4? | |
| 166. | Card games: Which is higher, 4 + 6 or 9 + 3? | |
| 167. | Card games: Which is lower, 9 + 3 or 6 + 7? | |
| 168. | Card games: Which is lower, 2 + 6 or 4 + 2? | |
| 169. | Who's going to Waterworld? 2+4+3+3 | |
| 170. | Chicken multiplication: 3 + 3 + 3 = ? |