146+275 = 307+826 = 725-368 = 400-26 = 438+262 = 417-48 = 435-359 = 300-154 = 560+780 = 365-137 = 563-284 = 700-47 = 236-119 = 523-483 = 213-175 = 500-489=

146 + 275 = 421;

307 + 826 = 1133;

725 - 368 = 357;

400 - 26 = 374;

438 + 262 = 700;

417 - 48 = 369;

435 - 359 = 76;

300 - 154 = 146;

560 + 780 = 1340;

365 - 137 = 228;

563 - 284 = 279;

700 - 47 = 653;

236 - 119 = 117;

523 - 483 = 40;

213 - 175 = 38;

500 - 489 = 11;