[tex]428 \times 27 = (400 + 28) \times 27 = \\ [/tex]
[tex]400 \times 27 + 28 \times 27 = [/tex]
[tex]10800 + (27 + 1)(27) = [/tex]
[tex]10800 + 27 \times 27 + 27 \times 1 = [/tex]
[tex]10800 + 729 + 27 = 11556[/tex]
