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