Step 1
Difficulty 1
| 1. | Bargain basement: $12+$6+$24 | |
| 2. | Mystery number: ?+7=252 | |
| 3. | Mystery number: ?+6=174 | |
| 4. | Mystery number: ?+7=451 | |
| 5. | Mystery number: ?+6+163 | |
| 6. | Mystery number: 106+11=? | |
| 7. | Mystery number: 514+12=? | |
| 8. | Mystery number: 913+13=? | |
| 9. | Mystery number: 711+17=? | |
| 10. | Mystery number: 133+16=? | |
| 11. | Same or different:44-8,14+23,22+18,19+17,54-18 | |
| 12. | Same or different:43-7,21+17,13+22,18+16,53-17 | |
| 13. | On the Board: *52+10*=3*8 | |
| 14. | On the Board: *8*+91=*78 | |
| 15. | On the Board: *46+*2=43* | |
| 16. | On the Board: *6*+73=5*6 | |
| 17. | On the Board: *4+7*=100 | |
| 18. | On the Board: *4+3*=100 | |
| 19. | Double up and add: Double 40, +4, +10 | |
| 20. | Double up and add: Double 30, +8, +10 | |
| 21. | Double up and add: Double 35, +9, +10 | |
| 22. | Double up and add: Double 37, +4, +10 | |
| 23. | Double up and add: Double 22, +8, +10 | |
| 24. | Adding Tens: 235+50 =? | |
| 25. | Adding Tens: 338+50=? | |
| 26. | Adding Tens: 562+30=? | |
| 27. | Adding Tens: ?+30=492 | |
| 28. | Complem. add/subtract: 136+419=555 | |
| 29. | Complem. add/subtract: 216+84=300 | |
| 30. | Complem. add/subtract: 112+32=144 | |
| 31. | Complem. add/subtract: 125+14=139 | |
| 32. | Complem. add/subtract: 105+24=129 | |
| 33. | Complem. add/subtract: 210+14=224 | |
| 34. | Add it up: Addition with regrouping 863+59 | |
| 35. | Add it up: Addition with regrouping 347+56 | |
| 36. | Add it up: Addition with regrouping 723+89 | |
| 37. | True or False?: 47+15=65 | |
| 38. | True or False?: 38+14=52 | |
| 39. | True or False?: 56+17=73 | |
| 40. | True or False?: 29+12=46 | |
| 41. | True or False?: 55+17=72 | |
| 42. | Hundreds and hundreds: 42?+3?8=79? | |
| 43. | Hundreds and hundreds: 17?+?23=2?7 | |
| 44. | True or False?: 36+49=85 | |
| 45. | True or False?: 62+29=81 | |
| 46. | Add these 3 numbers: 80 + 70 + 40 | |
| 47. | Add these 3 numbers: 90 + 60 + 30 | |
| 48. | Add these 3 numbers: 40 + 70 + 20 | |
| 49. | Add these 3 numbers: 30 + 20 + 90 | |
| 50. | Add these 3 numbers: 70 + 90 + 10 | |
| 51. | Write the missing number: 15 + 110 + ? = 134 | |
| 52. | Write the missing number: 18 + 111 + ? = 131 | |
| 53. | Write the missing number: 14 + 117 + ? = 139 | |
| 54. | The Mysteries of 50! 50-35,12,6 | |
| 55. | The Mysteries of 50! 50-16,21,30 | |
| 56. | Subtraction chains: ?-12-7-6=65, ?-11-6-13=50 | |
| 57. | Subtraction chains: ?-11-10-12, ?-8-11-4=7 | |
| 58. | Subtraction chains: ?-10-11-9, 50-12-8-7=23 | |
| 59. | Subtraction chains: ?-11-8-10, ?-9-6-7=34 | |
| 60. | Subtraction chains: ?-7-9-12, ?-12-5-11 | |
| 61. | Anyone for a burger? $20-($6+$5+$2) | |
| 62. | Bargain Basement: $40-3x$6=2x$4) | |
| 63. | Take Tens: 67-?=47,430-70=? | |
| 64. | Take Tens: 71-?=21,250-30=? | |
| 65. | Take Tens: 66-?=36,360-80=? | |
| 66. | Take Tens: 94-?=54,740-20=? | |
| 67. | Take Tens: 89-?=19,460-50=? | |
| 68. | Take Tens: 86-?=26,170-40=? | |
| 69. | Linh at the sweet shop: $2-(30c+5x10c) | |
| 70. | Take it away 352-18=334 | |
| 71. | Take it away 472-46=426 | |
| 72. | Hundreds Takeaway: 6*2-32* = *21 | |
| 73. | Hundreds Takeaway: **2-43*=362 | |
| 74. | Hundreds Takeaway: *1*-5*4=414 | |
| 75. | Hundreds Takeaway: *8*-2*2=132 | |
| 76. | Hundreds Takeaway: 5*9-35*=*11 | |
| 77. | True or False?: 15-9=11-7 | |
| 78. | True or False?: 12-8=11-7 | |
| 79. | True or False?: 25-4=26-2 | |
| 80. | Take it away 271-138 | |
| 81. | Take it away 692-459 | |
| 82. | Take it away 942-513 | |
| 83. | Take it away 794-387 | |
| 84. | Take it away 583-228 |