Mathdoku Sudoku (Daily Sudoku League #84)

Coming week we have Sudoku Mahabharat Math Variations and I decide to create some practice puzzles for this contest. I have created three Sudoku types that will be appearing in the contest. One Product Sudoku (Mini Sudoku Series #21) I have already published under the Mini Sudoku Series. The other two which I have created are this Mathdoku Sudoku which I published today. The remaining one is Frame Sudoku which is very tough. Being tough Prasanna suggested that Frame Sudoku will not very good practice for this contest, so I decided to post Frame Sudoku on coming Sunday. Current Mathdoku Sudoku is an easy one and can be good practice for Sudoku Mahabharat Math Variations.

Now coming to today's Sudoku Variations Mathdoku. In fact, there are many puzzles with the name Mathdoku. There was one old Sudoku published here on this blog titled Math-doku (Guest Authors Sudoku #8) is very similar to today's puzzle with the difference that a 3x3 square may not have all four operations. In the current version of this Sudoku, there will be four results given in a 3x3 box, and all the operations (-, +, /, *) have to apply exactly once in a 3x3 box. Moreover, there may be some 3x3 boxes in which these none operations will not be given.
There is also another version of this puzzle popularly known with another name CalcuDoku, which comes in different sizes and does not follow Standard Sudoku rules. So to differentiate from all different versions of Mathdoku, I am publishing this with the name Mathdoku Sudoku to specify that this Mathdoku does follow Standard Classic Sudoku rules.

This Mathdoku Sudoku is my 84th contribution to The League of Extraordinary Ladies and Gentlemen.

Rules of Mathdoku Sudoku

Classic Sudoku Rules apply. Additionally, In some 3x3 boxes, there are four circled numbers. For each box, these numbers are a result of different mathematical operations (-, +, /, *) between the digits on each side of the circle.