2+2 = 4
15+15 = 30
100+100 = 200
1592+1592 = 3184
11111+11111 = 22222
852147+852147 =? 1704924
452698+456 = 453154
789+123 = 912
12357+41875 = 54232
87+57 = 144
1000-50 = 950
200-45 = 155
853-428 = 425
41589-17 = 41572
545862-25 = 545837
741-147 = 594
8965-6589 = 2376
521-1 = 520
8521-807 = 7714
11111-222 = 10889