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As I'm not a guru yet in C++, here are few pointers

• Function names should start with lowercase letters e.g Minus() should be minus
• There is no need to have int has a return type for your function. void is a valid return type and it means return nothing. This would save you the lines of return 0
• Your divide and multiply functions may be prone to erroneous output. This casts your answer to int
• Avoid using namespace std because when you use additional libraries clashes may occur. Instead use qualified names e.g std::cout, std::endl etc
• I see duplicate codes, DRY up your main function. Make first and second numbers global so this can be read once and it's outside your if statement
• At this point, I will opt for a switch statement to make your main cleaner
• To make this robust, you probably have to check for if invalid input was typed by the user