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Please Excuse My Dear Aunt Sally (PEMDAS), she has the hardest time remembering how to make sense of these arithmetic rules...

What number goes in the space marked by a question mark?

(NOTE: Not all number lines have the distance between points be a unit of 1; any scale is possible.)

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The number line above shows an operation that is repeating. What could the operation be?

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What does the picture above illustrate?

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If

\[ \frac{A}{B} = \frac{C}{D} \]

then where is D?

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Which of these could be the values of \( A \), \( B \), and \( C \)?

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