To count money, they have to multiply. When the multiplication is finished they have to add the products together.
When some one deposits or withdraws money, the banker uses adding and subtracting to find the new balance of the account.
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Subtracting a fraction is the same as adding its negative.
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I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.