Because addition and subtraction are the basic arithmetic operators, which all other arithmetic operations are based on. Multiplication can be posed as repetitive addition. Raising to a power is repetitive multiplication, etc. The processor of a computer basically is just a really fast adder.
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why addition & substraction important in our daily life
Addition and subtraction are reverse operations.
Addition is the inverse operation to subtraction.
Subtraction can be seen as the inverse operation to addition.
Subtraction is the addition of a negative number.