Tess drew a scale drawing of a house and its lot. She used the scale 7 millimetres = 1 metre. What scale factor does the drawing use? Simplify your answer and write it as a ratio, using a colon.
1 meter =1,000 millimeters. So, the scale is:
7 mm:1,000 mm Divide both sides by 7
1 mm:142 6/7 mm - This is the scale that Tess used.