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Use the unit fraction 1/9 to represent the space between the tick marks on the number line. Write an expression involving subraction that is being modeled.

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Answer:

3/9 - 1/9

Step-by-step explanation:

Given that:

Distance between successive tickmarks = 1/9

Length of blue line = 3 * (1/9)

Length of red line = 1 * (1/9)

The expression being modeled by the number line :

Length of blue line - length of red line

3 *(1/9) - 1(1/9)

3/9 - 1/9

(3 - 1) / 9

= 2/9

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