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Basic Arithmetic

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

Number Line Warmup

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.)

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

What does the picture above illustrate?

If

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

then where is D?

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

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