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arithmetic the method and process of using whole numbers to add, subtract, multiply, and divide.
calculator A calculator is a machine that helps you do things with numbers. A calculator can help you add numbers together or subtract them or do many other things. Sometimes a calculator is very small and you can hold it in your hand. Sometimes a calculator is big or part of a computer.
debit to subtract or charge with an amount owed. [1/2 definitions]
deduct to subtract from another amount or sum.
minus Minus is a word we use when we are subtracting one number from another number--like when we subtract one from three and get two. Another way to say this is "three minus one equals two." The word minus tells us that a certain number is going to become less when the second number is taken away from it. [1/5 definitions]
operation An operation is something you do with numbers. When you add, subtract, multiply, or divide, you are doing operations. [1/4 definitions]
subtract When you subtract something, you take it away from something else. When you subtract an amount, you take it away from another amount.
take to subtract. [1/25 definitions]