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\[(100 + 60 + 8) \cdot 3 = 504\]
\[1)\ 100 \cdot 3 = 300\]
\[2)\ 60 \cdot 3 = 180\]
\[3)\ 8 \cdot 3 = 24\]
\[4)\ 300 + 180 + 24 =\]
\[= 300 + 204 = 504\]
\[(100 + 20 + 9) \cdot 6 = 774\]
\[1)\ 100 \cdot 6 = 600\]
\[2)\ 20 \cdot 6 = 120\]
\[3)\ 9 \cdot 6 = 54\]
\[4)\ 600 + 120 + 54 =\]
\[= 600 + 174 = 774\]
\[(100 + 90 + 8) \cdot 5 = 990\]
\[1)\ 100 \cdot 5 = 500\]
\[2)\ 90 \cdot 5 = 450\]
\[3)\ 8 \cdot 5 = 40\]
\[4)\ 500 + 450 + 40 = 990\]
\[(100 + 10 + 3) \cdot 7 = 791\]
\[1)\ 100 \cdot 7 = 700\]
\[2)\ 10 \cdot 7 = 70\]
\[3)\ 3 \cdot 7 = 21\]
\[4)\ 700 + 70 + 21 = 791\]