Solve the following addition and subtraction problems. Show your work.

Решение:

1. 266674 + 366529 = 633203
2. 585479 + 403213 = 988692
3. 920000 - 783454 = 136546
4. 304817 - 303445 = 1372
5. 167768 - 77777 = 89991
6. 290608 + 203454 = 494062
7. 168309 + 74588 = 242897
8. 293145 + 122592 = 415737
9. 800001 - 269134 = 530867
10. 544354 - 444172 = 100182
11. 711111 - 71006 = 640105
12. 493545 + 28455 = 522000
13. 721279 + 172613 = 893892
14. 363458 + 345876 = 709334
15. 706573 - 448877 = 257696
16. 757382 - 755190 = 2192
17. 317325 + 217287 = 534612
18. 844844 + 785156 = 1630000

Ответ: 1. 633203; 2. 988692; 3. 136546; 4. 1372; 5. 89991; 6. 494062; 7. 242897; 8. 415737; 9. 530867; 10. 100182; 11. 640105; 12. 522000; 13. 893892; 14. 709334; 15. 257696; 16. 2192; 17. 534612; 18. 1630000.