4. Вычисли: 380 × 60; 6700 × 90; 4500 × 800; 680 × 700; 270 000 : 3000; 360 000 : 600; 38 : 9; 75 : 8.

1. \(380 \times 60 = 380 \times 6 \times 10 = 2280 \times 10 = 22\,800\).
2. \(6700 \times 90 = 67 \times 9 \times 1000 \times 10 = 603 \times 10\,000 = 603\,000\).
3. \(4500 \times 800 = 45 \times 8 \times 100 \times 100 = 360 \times 10\,000 = 3\,600\,000\).
4. \(680 \times 700 = 68 \times 7 \times 100 \times 100 = 476 \times 10\,000 = 476\,000\).
5. \(270\,000 : 3000 = 270 : 3 = 90\).
6. \(360\,000 : 600 = 3600 : 6 = 600\).
7. \(38 : 9 = 4\) (остаток 2), так как \(9 \times 4 = 36\), а \(38 - 36 = 2\).
8. \(75 : 8 = 9\) (остаток 3), так как \(8 \times 9 = 72\), а \(75 - 72 = 3\).

Ответ: 22 800; 603 000; 3 600 000; 476 000; 90; 600; 4 (ост. 2); 9 (ост. 3).