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)
28 + 247 = 275
51 + 226 = 277
268 - 24 = 244
184 - 68 = 116
61 - 55 = 6
1 + 165 = 166
32 + 203 = 235
147 + 106 = 253
183 - 31 = 152
116 + 37 = 153
71 - 22 = 49
5 + 193 = 198
67 + 10 = 77
2 + 4 = 6
178 - 138 = 40
46 + 135 = 181
71 - 39 = 32
78 + 103 = 181
141 + 14 = 155
263 - 62 = 201
233 - 91 = 142
124 + 142 = 266
242 - 123 = 119
114 + 136 = 250
39 + 199 = 238
28 + 39 = 67
222 + 20 = 242
267 - 52 = 215
121 - 77 = 44
192 - 28 = 164
62 + 30 = 92
181 - 101 = 80
118 + 108 = 226
107 + 143 = 250
258 + 10 = 268
48 + 18 = 66
140 - 48 = 92
147 - 5 = 142
261 - 245 = 16
173 + 53 = 226
119 + 153 = 272
13 + 159 = 172
141 - 104 = 37
71 + 32 = 103
35 + 139 = 174
32 + 16 = 48
207 - 159 = 48
90 + 32 = 122
173 - 66 = 107
239 - 71 = 168
274 - 84 = 190
33 - 9 = 24
62 + 43 = 105
277 - 75 = 202
118 + 129 = 247
254 + 25 = 279
61 + 77 = 138
239 - 195 = 44
66 + 188 = 254
253 - 248 = 5
66 + 17 = 83
219 + 31 = 250
224 - 100 = 124
163 + 91 = 254
13 + 11 = 24
228 + 25 = 253
137 - 123 = 14
240 - 44 = 196
157 + 49 = 206
243 - 201 = 42
270 - 24 = 246
19 + 76 = 95
234 - 84 = 150
40 + 123 = 163
64 + 204 = 268
24 + 22 = 46
254 - 212 = 42
214 + 30 = 244
150 + 68 = 218
200 - 2 = 198
24 - 16 = 8
9 + 127 = 136
213 - 119 = 94
20 + 139 = 159
182 - 114 = 68
131 + 113 = 244
65 + 124 = 189
42 + 60 = 102
91 + 102 = 193
226 + 50 = 276
146 + 94 = 240
163 + 4 = 167
242 - 65 = 177
90 + 50 = 140
272 - 122 = 150
201 + 15 = 216
241 - 219 = 22
20 + 44 = 64
29 + 195 = 224
227 - 221 = 6