Ответ:

  1. 1849 × 372 = 1849 × (300 + 70 + 2) = 554 700 + 129 430 + 3 698 = 687 828.

  2. 4079 × 681 = 4079 × (600 + 80 + 1) = 2 447 400 + 326 320 + 4 079 = 2 777 799.

  3. 4502 × 783 = 4502 × (700 + 80 + 3) = 3 151 400 + 360 160 + 13 506 = 3 525 066.

  4. 9316 × 615 = 9316 × (600 + 10 + 5) = 5 589 600 + 93 160 + 46 580 = 5 729 340.