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C.Our four operations are addition, subtraction, multiplication and division. Here is a description of each and some key words that you can look for when reading a problem. Addition – a problem where two quantities are being combined. Key words are sum, total, in all, combined, altogether
D.A mathematical sentence, also called mathematical statement, statement, or proposal, is a sentence that can be identified as either true or false. For example, " 6 is a prime number " is a mathematical sentence or simply statement.