Multiplication Sudoku (Fun With Sudoku #23)

I saw this Sudoku first time in World Sudoku Championship 2009 (Puzzle L7). This puzzle I created for the Indian Team practice that time. I have posted this Sudoku in May 2010 on this blog. Now I am re-posting this Sudoku as part of Fun With Sudoku Series as 23rd Sudoku.
Rules of Multiplication Sudoku
Classic Sudoku Rules apply. Additionally marked pairs cells indicate result of multiplication of two indicated digits.

Multiplication Sudoku  (Fun With Sudoku #23)
Multiplication Sudoku  (Fun With Sudoku #23)

Fortress Sudoku (Daily Sudoku League #67) Solution
Fortress Sudoku (Daily Sudoku League #67) Solution

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