Step 4
Difficulty 4
1. | Add these 3 numbers: 14 + 5 + 2 | |
2. | Add these 3 numbers: 11 + 4 + 5 | |
3. | Add these 3 numbers: 13 + 7 + 6 | |
4. | Adding tens: 38 + 20 = ? | |
5. | Adding tens: 56 + 30 = ? | |
6. | Now Add This! 34+11, 34+12 | |
7. | Now Add This! 33+19, 33+21 | |
8. | Add three numbers: 14 + 7 + 3 | |
9. | Add three numbers: 10 + 12 + 8 | |
10. | Make 36: 20 + 14 + ? | |
11. | Make 39: 30 + 6 + ? | |
12. | Make 37: 12 + 20 + 5 | |
13. | Number detectives: 30+?, 50+?, 60+? =100 | |
14. | Add three numbers: 2 + 13 + 9 | |
15. | Add three numbers: 15 + 7 + 8 | |
16. | Add three numbers: 17 + 7 + 12 | |
17. | Number detectives: ? + 9 = 49 | |
18. | Number detectives: ? + 11 = 53 | |
19. | Crossing 100: 4 more than 99 | |
20. | Crossing 100: 7 more than 97 | |
21. | Crossing 100: 8 more than 98 | |
22. | Crossing 100: 9 more than 92 | |
23. | Crossing 100: 5 more than 97 | |
24. | True or False: 12+14=26 | |
25. | True or False: 12+12=24 | |
26. | True or False: 13+14=28 | |
27. | True or False: 15+12=27 | |
28. | True or False: 16+11=25 | |
29. | Same or Different: Click all the boxes with the answer 50. | |
30. | Same or Different: Click all the boxes with the answer 46. | |
31. | Same or Different: Click all the boxes with the answer 32. | |
32. | Same or Different: Click all the boxes with the answer 45. | |
33. | Same or Different: Click all the boxes with the answer 38. | |
34. | Make 50: 39+7+? = 50 | |
35. | Make 50: 39+5+? = 50 | |
36. | Make 50: 35+5+? = 50 | |
37. | Make 50: 38+10+? = 50 | |
38. | Make 50: 42+6+? = 50 | |
39. | Beyond 70: 5 more than 79 | |
40. | Beyond 70: 9 more than 72 | |
41. | 36 + 12 = 48 So what else is true? | |
42. | Add board 5* + 46 = *8 | |
43. | Add board 35 + *3 = 7* | |
44. | Same or different:19-12,2+5,3+4,33-26,16-8 | |
45. | Use the pattern: 10, 20 & 80 - 5 = ? | |
46. | Use the pattern: 10, 20 & 40 - 3 = ? | |
47. | Use the pattern: 10, 20 & 90 - 7 = ? | |
48. | Use the pattern: 10, 20 & 50 - 4 = ? | |
49. | Use the pattern: 10, 20 & 30 - 8 = ? | |
50. | Mysteries of Fifty: 50-?=48, 50-?=43 | |
51. | Mysteries of Fifty: 50-?=44, 50-?=47 | |
52. | Use the pattern 13-6=? 23-6=?, 33-6=? | |
53. | Use the pattern 12-9=? 22-9=?, 32-9=? | |
54. | Use the pattern 19-4=? 29-4=?, 39-4=? | |
55. | The 9 family: Take 9, 19 & 29 from 57 | |
56. | Spot the difference between 20 and 39. | |
57. | Spot the difference between 18 and 25. | |
58. | Spot the difference between 25 and 34. | |
59. | Spot the difference between 19 and 31. | |
60. | Spot the difference between 19 and 42. | |
61. | Spot the difference between 36 and 15. | |
62. | Write the missing number: 20 + 3 + ? = 30 | |
63. | Write the missing number: 12 + ? + 10 = 30 | |
64. | Write the missing number: 15 + ? + 5 = 30 | |
65. | Write the missing number: 9 + ? + 12 = 30 | |
66. | Write the missing number: ? + 5 + 4 = 30 | |
67. | Write the missing number: 15 + ? + 6 = 30 | |
68. | Write the missing number: 20 + 3 + ? = 30 | |
69. | Number detectives: 30 - ? = 15 | |
70. | Number detectives: 30 - ? = 13 | |
71. | Taking Tens: 98 - 50 | |
72. | Taking Tens: 32 - 20 | |
73. | Taking Tens: 59 - 40 | |
74. | Taking Tens: 87 - 20 | |
75. | Taking Tens: 72 - 40 | |
76. | Subtract.chains 48 - 7 - 2 - 9, 35 - 4 - 3 - 8 | |
77. | Spot the difference: 50 & 41, 100 & 92, 101 & 98 | |
78. | Subtraction chains 80-6-5-3, 70-4-2-5 | |
79. | Subtraction chains 30-9-2-5, 60-5-4-3 | |
80. | Subtraction chains 40-5-6-3, 50-9-2-8 | |
81. | Subtraction chains 90-3-5-3, 40-2-8-5 | |
82. | Subtraction chains 60-9-2-3, 50-3-6-10 | |
83. | 19 go to Waterworld: 5+4+3+? | |
84. | Make 50: 32+8+? = 50 | |
85. | Andrew at the shop: 50c - 25c | |
86. | Madeline at the shop: 50c - 5c | |
87. | Gavin at the shop: 60c + 10c | |
88. | Damien at the shop: 10c + 5c | |
89. | Jenny at the shop: 60c + 30c | |
90. | Sarah at the shop: 50c + 40c |