Ответ:

  1. 376 × 568 = 376 × (500 + 60 + 8) = 188 000 + 22 560 + 3 008 = 213 568.

  2. 206 × 316 = 206 × (300 + 10 + 6) = 61 800 + 2 060 + 1 236 = 65 096.

  3. 145 × 321 = 145 × (300 + 20 + 1) = 43 500 + 2 900 + 145 = 46 545.