Ответ:

  1. \(35\cdot18=630\).
  2. \(279\cdot42=11\,718\).
  3. \(74\cdot953=70\,522\).
  4. \(506\cdot125=63\,250\).
  5. \(817\cdot304=248\,368\).
  6. \(608\cdot207=125\,856\).
  7. \(123\,450\cdot7\,800=963\,?\) \(123\,450\cdot78\cdot100=9\,629\,100\cdot100=962\,910\,000\).
  8. \(69\,080\cdot10\,500=69\,080\cdot105\cdot100=7\,253\,400\cdot100=725\,340\,000\).

Ответ: 630; 11 718; 70 522; 63 250; 248 368; 125 856; 962 910 000; 725 340 000.