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 |