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The relationship between addition and subtraction is inverse. We can add two counting numbers together, and we do not need to pay attention to the order of these whole numbers. But, for subtraction, we have to subtract the smallest counting number from the largest counting number.
No.
Column method can be used for both !
No they didn't, it was the Etruscans that invented this method of counting by symbols. No they didn't, it was the Etruscans that invented this method of counting by symbols.
brackets indices division multiplication addition subtraction