9. 650 + 30, 780 - 70, 240 - 20, 40 · 4, 80 · 7, 90 · 6, 640 : 8, 540 : 9, 270 : 3, 130 · 5, 150 · 4, 750 : 3

Решение:

1. \( 650 + 30 = 680 \)
2. \( 780 - 70 = 710 \)
3. \( 240 - 20 = 220 \)
4. \( 40 \times 4 = 160 \)
5. \( 80 \times 7 = 560 \)
6. \( 90 \times 6 = 540 \)
7. \( 640 : 8 = 80 \)
8. \( 540 : 9 = 60 \)
9. \( 270 : 3 = 90 \)
10. \( 130 \times 5 = 650 \)
11. \( 150 \times 4 = 600 \)
12. \( 750 : 3 = 250 \)

Ответ: 680, 710, 220, 160, 560, 540, 80, 60, 90, 650, 600, 250.