[tex]542 + 459 = 1001 \\ 675 + 158 = 833 \\ 634 + 478 = 1112 \\ 345 + 198 = 543 \\ 76 + 167 = 243 \\ 167 + 258 = 425 \\ 452 - 89 = 363 \\ 201 - 89 = 112 \\ 374 + 378 = 752[/tex]
