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A calculator.

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Q: What is a computer that adds and subtracts?
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What does the Arithmetic Machine do?

It adds and subtracts numbers.


What subtracts to 23 and adds to 132?

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What is the rule in comparing a set of fractions?

the top adds what the bottom adds. the top subtracts what the bottom subtracts. the top divides what the bottom divides. the top multiplies what the bottom multiplies.


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