Complete number sentences involving addition and subtraction by calculating missing numbers, eg find the missing numbers: ( ) + 55 = 88, ( ) - 15 = 19

1. Number Detectives: 10 + ? = 34
2. Make 19: 8+6+?
3. Make 18: 4+11+?
4. Make 20: 9+11+?
5. Make 20: 9+6+?
6. Adding tens: 26 + ? = 36
7. Adding tens: 46 + ? = 56
8. Adding tens: 64 + ? = 94
9. Adding tens: ?+ 36 = 66
10. Adding tens: ?+ 73 = 83
11. Adding tens: ?+ 46 = 86
12. Number detectives: Mysteries of 15
13. Number detectives: Mysteries of 16
14. Number detectives: Mysteries of 13
15. Number detectives: Mysteries of 17
16. Number detectives: Mysteries of 14
17. Make 30: 20 + 7 + ? = 30
18. Adding tens: 120 + ? = 140; 120 + 50 = ?
19. Adding tens: 24 + ? = 64, 24 + 50 = ?
20. Adding tens: 145 + ? = 155, 145 + 30 = ?
21. Adding tens: 57 + ? = 97, 57 + 20 = ?
22. Adding tens: 138 + ? = 178, 178 + 20 = ?
23. Number Detectives: ? + 7 = 30
24. Number Detectives: ? + 24 = 30
25. Number Detectives: 22 + ? = 30
26. Number Detectives: 21 + ? = 30
27. Number detectives: 30+?, 50+?, 60+? =100
28. Number detectives: 80+?, 90+?, 40+?=100
29. Number detectives: 10+?, 70+?, 50+?=100
30. Number detectives: 25+?, 35+?, 55+? =100
31. Number detectives: 5+?, 45+?, 15+?=100
32. Addition Chains: 2 + 4 + 3 + 10, 12 + 1 + 2 + 7
33. Addition Chains: 3 + 2 + 4 + 8, 4 + 3 + 7 + 4
34. 100 Zone: 93 + 10, 94 + 10, 96 + 10
35. 100 Zone: 90 + 10, 92 + 10, 97 + 10
36. 100 Zone: 95 + 10,10 + 95, 105 - 10
37. 100 Zone: 98 + 10,10 + 98, 108 - 10
38. 100 Zone: 99 + 10,109 - 10, 10 + 99
39. Number detectives: ? + 9 = 49
40. Number detectives: ? + 11 = 53
41. Number detectives: 35+? = 46
42. N/D Mysteries of 40! 34+? 30+? 38+?=40
43. N/D Mysteries of 40! 31+? 36+? 30+?=40
44. N/D Mysteries of 40! 33+? 37+? 32+?=40
45. N/D Mysteries of 40! 32+? 39+? 34+?=40
46. N/D Mysteries of 40! 31+? 35+? 37+?=40
47. 100 Zone: 70 + 40 = ? 90 + ? = 110, ? + 80 = 110
48. 100 Zone: 60 + 80 = ? 90 + ? = 140, ? + 100 = 140
49. 100 Zone: 70 + 80 = ? 100 + ? = 150, ? + 70 = 150
50. 100 Zone: 90 + 70 = ? 80 + ? = 160, ? + 60 = 160
51. 100 Zone: 95+7=? 101-?=99 ?+6=103
52. 100 Zone: 95+6=? 103-?=99 ?+6=104
53. 100 Zone: 98+7=? 105-?=98 ?+6=105
54. 100 Zone: 98+6=? 102-?=98 ?+5=103
55. 100 Zone: 98+3=? 101-?=97 ?+5=102
56. Number detectives *+109 = 113
57. Number detectives *+4 = 103
58. Number detectives *+5 = 103
59. Number detectives 485+*= 493
60. Number detectives 515+*= 523
61. Number detectives 95+*=101
62. Number detectives 97+*=103
63. Number Detectives: 100 Pairs ? + 79 = 100
64. Number Detectives: 100 Pairs ? + 51 = 100
65. Number Detectives: 100 Pairs 88 + ? = 100
66. Adding Tens 167 + * = 197
67. Add Hundreds: 600+ * = 946
68. Add Hundreds: 200+ * = 580
69. Add Hundreds: 400+ * = 963
70. Add Hundreds: 100+ * = 319
71. Add Hundreds: 300+ * = 565
72. Adding Tens: * + 726 = 786
73. Adding Tens: * + 314 = 394
74. Add Hundreds: * + 300 = 330
75. Add Hundreds: * + 200 = 241
76. Add Hundreds: * + 800 = 819
77. Add Hundreds: * + 300 = 345
78. Add Hundreds: * + 200 = 295
79. Number Detectives: 100 Pairs 85 + ?, 75 + ?, 45 +?= 100
80. Mystery number: ?+7=252
81. Mystery number: ?+6=174
82. Mystery number: ?+7=451
83. Mystery number: ?+6=512
84. Mystery number: ?+6+163
85. Mystery number: 157+?=163
86. Mystery number: 133+?=146
87. Mystery number: 212+?=224
88. Mystery number: 106+?=118
89. Mystery number: 106+?=118
90. Adding Tens: 142+?=182
91. Adding Tens: 30+?=574
92. Adding Tens: ?+30=492
93. Mysteries of 30!: 20+?, 15+?, 5+?
94. Mysteries of 30!: 19+?, 10+?, 16+?
95. Mysteries of 30!: 12+?, 13+?, 14+?
96. Mysteries of 30!: 9+?, 5+?, 7+?
97. Mysteries of 30!: 26+?, 28+?, 22+?
98. 100 zone: 796+7,794+8,799+6
99. 100 zone: 593+7,594+8,596+5
100. 100 zone: 693+9,695+8,697+7
101. 100 zone: 392+6,393+7,392+8
102. 100 zone: 196+9,194+7,197+5
103. Number detectives: 30+?, 20+?, 10+?=100
104. Number detectives: 60+?, 50+?, 75+?=100
105. Number detectives: 65+?, 55+?, 85+?=100
106. Number detectives: 82+?, 24+?, 76+?=100
107. Number detectives: 89+?, 21+?, 59+?=100
108. Addition chains 10 multiples
109. Addition chains 10 multiples
110. Addition chains 10 multiples
111. Number detectives: ? - 5 = 10
112. Number detectives: ? - 6 = 3
113. Number detectives: ? - 7 = 2
114. Number detectives: ? - 7 = 6
115. Number detectives: ? - 8 = 4
116. Taking Tens: 90 - ? = 70
117. Subtraction Chain - 22-4=?-3=15
118. Subtraction Chain - ?-8=16-2=14
119. Subtraction Chain - 21-4 =?-1= 16
120. Subtraction Chain - ?-4=19-3=16
121. Mysteries of Fifty: 50-?=42, 50-?=45
122. Mysteries of Fifty: 50-?=48, 50-?=43
123. Mysteries of Fifty: 50-?=44, 50-?=47
124. Mysteries of Forty: 40-?=36, 40-?=31
125. Mysteries of Forty: 40-?=33, 40-?=39
126. Mysteries of Forty: 40-?=35, 40-?=38
127. Mysteries of Thirty: 30-?=29, 30-?=24
128. Mysteries of Thirty: 30-?=21, 30-?=27
129. Mysteries of Thirty: 30-?=26, 30-?=22
130. Number detectives: ? + 23 = 30
131. Number detectives: ? + 18 = 30
132. Number detectives: 30 - ? = 15
133. Number detectives: 30 - ? = 13
134. Number Detectives: ? - 15 = 10
135. Number Detectives: ? - 9 = 21
136. Number Detectives: 30 - ? = 12
137. Number Detectives: 40 - ? = 29
138. Subtracting tens: 88 - ? = 48
139. Subtracting tens: 57 - ? = 27
140. Subtracting tens: 44 - ? = 24
141. Subtracting tens: 86 - ? = 56
142. Subtracting tens: 94 - ? = 24
143. The Mysteries of 40!: 40-?=31, 40-?=33, 40-?=30
144. The Mysteries of 40!: 40-?=51, 40-?=38, 40-?=32
145. The Mysteries of 40!: 40-?=32, 40-?=29, 40-?=37
146. The Mysteries of 40!: 40-?=29, 40-?=38, 40-?=39
147. The Mysteries of 40!: 40-?=30, 40-?=33, 40-?=36
148. The Mysteries of 40!: 40-?=29, 40-?=31, 40-?=33
149. The Mysteries of 40!: 40-?=28, 40-?=32, 40-?=18
150. The Mysteries of 30!: 30-?=26, 30-?=23, 30-?=27
151. The Mysteries of 30!: 30-?=23, 30-?=13, 30-?=3
152. The Mysteries of 30!: 30-?=18, 30-?=15, 30-?=12
153. The Mysteries of 30!: 30-?=14, 30-?=19, 30-?=9
154. Subtraction chains: 30-4-10-8, 30-5-10-7
155. Subtraction chains: 30-8-6-12, 30-6-3-5
156. The Mysteries of 40! 40-14,23,19
157. The Mysteries of 40! 40-8,12,25
158. The Mysteries of 40! 40-20,15,9
159. The Mysteries of 50! 50-35,12,6
160. The Mysteries of 50! 50-16,21,30
161. Subtraction chains: ?-12-7-6=65, ?-11-6-13=50
162. Subtraction chains: ?-11-10-12, ?-8-11-4=7
163. Subtraction chains: ?-10-11-9, 50-12-8-7=23
164. Subtraction chains: ?-11-8-10, ?-9-6-7=34
165. Subtraction chains: ?-7-9-12, ?-12-5-11
166. Take Tens: 67-?=47,430-70=?
167. Take Tens: 71-?=21,250-30=?
168. Take Tens: 66-?=36,360-80=?
169. Take Tens: 94-?=54,740-20=?
170. Take Tens: 89-?=19,460-50=?
171. Take Tens: 86-?=26,170-40=?
172. Take Tens: 45-?=35,580-90=?
173. Take Tens: 62-?=22,880-50=?
174. Take Tens: 73-?=53,630-90=?
175. Take Tens: 98-?=18,920-60=?
176. Take tens: 527-?=497
177. Take tens: 849-?=759
178. Take tens: 321-?=251
179. Take tens: 513-?=463
180. Take tens: 655-?=595
181. Mysteries of 100!: 100-?=77, 100-?=60, 100-?=88
182. Mysteries of 100!: 100-?=45, 100-?=28, 100-?=66
183. Mysteries of 100!: 100-?=40, 100-?=75, 100-?=62
184. Mysteries of 100!: 100-?=19, 100-?=80, 100-?=69
185. Mysteries of 100!: 100-?=76, 100-?=65, 100-?=54
186. What Was I Thinking? - find original number after operations
187. What Was I Thinking? - find original number after operations
188. What Was I Thinking? - find original number after operations
189. Number Quest - complete number sentence
190. Number Quest - complete number sentence
191. Number Quest - complete number sentence
192. Number Quest - complete number sentence
193. Number Quest - complete number sentence