□ − 70 = 160; □ + 220 = 330; 600 − □ = 350; 126 : 2 = □; 40 + □ = 760; □ : 2 = 208; 160 · 3 = □; 577 − □ = 555; 400 + □ = 808; 1000 : □ = 2; 84 · □ = 168; 2 · □ = 900; 484 : □ = 4.

1. □ − 70 = 160
   □ = 160 + 70 = 230
2. □ + 220 = 330
   □ = 330 − 220 = 110
3. 600 − □ = 350
   □ = 600 − 350 = 250
4. 126 : 2 = 63
5. 40 + □ = 760
   □ = 760 − 40 = 720
6. □ : 2 = 208
   □ = 208 · 2 = 416
7. 160 · 3 = 480
8. 577 − □ = 555
   □ = 577 − 555 = 22
9. 400 + □ = 808
   □ = 808 − 400 = 408
10. 1000 : □ = 2
    □ = 1000 : 2 = 500
11. 84 · □ = 168
    □ = 168 : 84 = 2
12. 2 · □ = 900
    □ = 900 : 2 = 450
13. 484 : □ = 4
    □ = 484 : 4 = 121

Ответ: 230; 110; 250; 63; 720; 416; 480; 22; 408; 500; 2; 450; 121.