Carmen measured a house and made a scale drawing. the scale of the drawing was 9 millimeters = 1 meter. what is the drawing's scale factor? write it as a fraction.

When you write a scale factor, the units have to be the same.  In this case, 9mm on the drawing represents 1 meter on the house.  Change 1 meter to millimeters (1m = 1000mm).

9 mm on the drawing represents 1000 mm on the house.

The scale factor is 9 to 1000, or, as a fraction,  9/1000.

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