Ответ:

  1. \(123 \cdot 8 = 984\).

  2. \(5662 \cdot 9 = 50\,958\).

  3. \(23 \cdot 45 = 1035\).

  4. \(248 \cdot 17 = 248 \cdot (10 + 7) = 2480 + 1736 = 4216\).

  5. \(123 \cdot 305 = 123 \cdot (300 + 5) = 36\,900 + 615 = 37\,515\).