280以内加减法，链接后加“?x=300”可调整加大计算数值，最大300。点此切换答案显示，方便截图打印。
注：改变浏览窗口大小，可调整每行题数，本页默认会显示100道，刷新页面随机重排。黑海豚设计（交流QQ:6932391)
49 + 2 = 51
241 - 203 = 38
11 + 185 = 196
113 - 24 = 89
45 + 216 = 261
261 - 133 = 128
247 - 87 = 160
204 + 34 = 238
108 - 38 = 70
252 - 151 = 101
39 - 18 = 21
138 + 4 = 142
255 - 194 = 61
99 + 56 = 155
86 + 168 = 254
89 - 30 = 59
207 - 154 = 53
178 + 79 = 257
187 + 32 = 219
271 - 128 = 143
153 + 79 = 232
93 + 133 = 226
57 + 23 = 80
79 + 136 = 215
214 - 67 = 147
167 + 28 = 195
194 - 169 = 25
215 + 63 = 278
81 + 150 = 231
46 + 169 = 215
77 + 33 = 110
143 - 29 = 114
102 - 46 = 56
201 - 177 = 24
249 - 90 = 159
145 - 37 = 108
235 - 17 = 218
97 + 162 = 259
64 - 29 = 35
155 - 102 = 53
116 - 102 = 14
17 + 119 = 136
100 + 5 = 105
240 - 188 = 52
39 + 61 = 100
119 + 33 = 152
30 + 194 = 224
256 - 135 = 121
212 - 196 = 16
233 - 42 = 191
174 + 69 = 243
195 - 127 = 68
222 - 168 = 54
31 + 114 = 145
232 - 150 = 82
271 - 113 = 158
240 - 4 = 236
107 + 46 = 153
173 - 170 = 3
20 + 247 = 267
32 + 221 = 253
235 - 10 = 225
91 - 52 = 39
240 - 151 = 89
63 + 121 = 184
155 + 91 = 246
40 + 205 = 245
95 - 65 = 30
259 + 6 = 265
86 + 76 = 162
272 - 48 = 224
253 - 250 = 3
156 + 93 = 249
185 - 131 = 54
192 - 130 = 62
59 - 9 = 50
117 + 26 = 143
225 - 157 = 68
151 + 91 = 242
267 - 250 = 17
113 + 15 = 128
83 + 105 = 188
67 + 77 = 144
22 + 106 = 128
145 - 34 = 111
213 - 119 = 94
209 - 76 = 133
89 + 144 = 233
188 + 3 = 191
66 - 13 = 53
95 + 37 = 132
118 + 4 = 122
28 + 203 = 231
175 - 71 = 104
88 - 48 = 40
75 + 119 = 194
16 + 234 = 250
91 + 145 = 236
229 - 39 = 190
152 - 67 = 85