addition
17 + 23
40
58 + 31
89
Half of 84
42
52 - 21
31
Double 26
52
Double 28
56
Half of 90
45
Half of 104
52
237+8
245
167 + 98
265
234 - 7
227
168 - 34
134
326 + 274
600
765 + 145
910
420-122
298
237 - 78
159
2378 + 998
3376
3972 - 998
2974