Product Sudoku (Mini Sudoku Series #21)

After Sudoku Champs 2015, it is time to practice and participate in the Math Variations round of Sudoku Mahabharat. This Math Variations round is having quite interesting Sudoku variations. As we all know that Sudoku is not at all a Mathematical puzzle. It is a logical puzzle that just uses numbers. These numbers can be replaced with pictures or alphabets to make them fully independent of numbers. Anyway, I like Mathematically puzzles and Kakuro is one of the Mathematically puzzles generally known as the Math Crossword puzzle. In Sudoku too there are many variations that use some Mathematically operations to solve the Sudoku. This weekend we have a Math Variations round of Sudoku Mahabharat, which includes Sudoku variations that use Math.
I will be putting some practice puzzles for this Sudoku Championship. Starting with an easy one Product Sudoku. I am posting this Product Sudoku as the 21st Sudoku in Mini Sudoku Series.

Rules of Product Sudoku

Mini Classic Sudoku Rules apply. Additionally, for each shaded 2x2 area, the two-digit number formed in the bottom row is the product of the two digits in the top row.