Add and subtract numbers mentally with increasingly large numbers

1. 100 less, 100 more than 69 582
2. Changing Numbers: Add 100, 1000, 10 000 to 33 125
3. Changing Numbers: Add 100, 1000, 10 000 to 78 244
4. Changing Numbers: Add 1000, 10 000, 100 000 to 213 426
5. Changing Numbers: Add 1000, 10 000, 100 000 to 423 846
6. 1000 less, 100 more than 5 268 635
7. 100 less, 1000 more than 453 369
8. 1000 less, 10 more than 317 691
9. 10 less, 1000 more than 8 254 146
10. 1000 less, 1000 more than 6 325 478
11. 1000 less, 100 more than 2 135 698
12. 10 000 less, 1000 more than 9 630 258
13. 10 000 less, 100 000 more than 9 654 128
14. 1000 less, 1000 more than 6 598 696
15. Mystery number: 106+11=?
16. Mystery number: 514+12=?
17. Mystery number: 913+13=?
18. Mystery number: 711+17=?
19. Mystery number: 133+16=?
20. Number detectives: 102+98=?
21. True or False?: 63+8=65+6
22. True or False?: 26+7=29+4
23. Same or different: Click all the boxes with the same answer.
24. Same or different: Click all the boxes with the same answer.
25. Same or different: Click all the boxes with the same answer.
26. Same or different: Click all the boxes with the same answer.
27. Same or different: Click all the boxes with the same answer.
28. True or False? Click all the number sentences that are true.
29. True or False? Click all the number sentences that are true.
30. True or False? Click all the number sentences that are true.
31. True or False? Click all the number sentences that are true.
32. True or False? Click all the number sentences that are true.
33. True or False? Click all the number sentences that are true.
34. Changing numbers: 36 159 add 100 add 1 add 10
35. Changing numbers: 23 855 add 100 add 1 add 10
36. Changing numbers: 36 052 add 1000 add 1 add 10
37. Changing numbers: 23 615 add 1000 add 100 add 10
38. Changing numbers: 36 925 add 10 add 1000 add 1
39. True or False: Double-sided equations
40. True or False: Double-sided equations
41. True or False: Double-sided equations
42. True or False: Double-sided equations
43. True or False: Double-sided equations
44. Add these 3 numbers: 40 + 70 + 20
45. Add these 3 numbers: 30 + 20 + 90
46. Add these 3 numbers: 70 + 90 + 10
47. Same or different : Click all the boxes with the same answer.
48. Same or different : Click all the boxes with the same answer.
49. Same or different : Click all the boxes with the same answer.
50. Same or different : Click all the boxes with the same answer.
51. Same or different : Click all the boxes with the same answer.
52. T/f Double sided eqns
53. T/f Double sided eqns
54. T/f Double sided eqns
55. T/f Double sided eqns
56. T/f Double sided eqns
57. Number detectives: Four's no chore - Add 4 clustered numbers
58. Number detectives: Four's no chore - Add 4 clustered numbers
59. Number detectives: Four's no chore - Add 4 clustered numbers
60. Same or different: Click all the boxes with the same answer
61. Same or different: Click all the boxes with the same answer
62. Same or different: Click all the boxes with the same answer
63. Same or different: Click all the boxes with the same answer
64. Same or different: Click all the boxes with the same answer
65. T/F double sided: 56+14=35+35, etc
66. T/F double sided: 23+12=65+30, etc
67. T/F double sided: 21+80=92-42, etc
68. T/F double sided: 42+46=19+69
69. T/F double sided: 32+18=25+25
70. Number detectives: Add 4 clustered tens numbers
71. Number detectives: Add 4 clustered tens numbers
72. Number detectives: Add 4 clustered tens numbers
73. True or False?: 15 - 5 = 30 - 20
74. True or False?: 30 - 5 = 28 - 3
75. True or False?: 12-8=11-7
76. True or False?: 99-66=44-11
77. True or False?: 50-5=90-45
78. True or False?: 35-15=40-20
79. Same or different: Click all boxes with the answer 126
80. Same or different: Click all boxes with the answer 175
81. Same or different: Click all boxes with the answer 146
82. Same or different: Click all boxes with the answer 194
83. True or False?: 118 - 25 = 243 - 150
84. Same or different: Click all boxes with the same answer
85. Same or different: Click all boxes with the same answer
86. Same or different: Click all boxes with the same answer
87. Same or different: Click all boxes with the same answer
88. Same or different: Click all boxes with the same answer
89. True or False: 631-82=549
90. True or False: 297=342-45
91. True or False: 746-53=693
92. Same or Different - Click all the boxes where the answer is 84
93. Same or Different - Click all the boxes where the answer is 387
94. Same or Different - Click all the boxes where the answer is 792
95. True/false: 128-64=145-81
96. True/false: 154-72=172-90
97. True/false: 136-61=125-50