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 |