Ответ:

  1. 111 ⋅ 10 = 1110
  2.   111
    x 11
    -----
      111
    +111
    -----
    10101
    

    111 ⋅ 11 = 10101

  3.    1101
    x  101
    ------
       1101
    +0000
    1101
    ------
    1000001
    

    1101 ⋅ 101 = 1000001

  4. 1101 ⋅ 1000 = 1101000

Ответ: 1) 1110; 2) 10101; 3) 1000001; 4) 1101000.