millimeter-mm centimeter-cm kilometer-km SO MILLIMETER
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To simplify a scale, convert to the same units, drop the units and divide by their highest common factor: 1 cm = 10 mm drawing : object = 8 mm : 1 cm → 8 mm : 1 × 10 mm → 8 mm : 10 mm → 8 : 10 → 4 : 5 → object is larger than scale drawing.
Convert the km to mm, then the units can be removed and the ratio found: 1 m = 1,000 mm 1 km = 1,000 m = 1,000 x 1,000 mm = 1,000,000 mm ⇒ 1 mm : 50 km → 1 mm : 50 x 1,000,000 mm → 1 mm : 50,000,000 mm → 1 : 50,000,000
to work out the scale we take the number of mm in 1m =1000 and then divide by the scale factor in this case 1:75 so 1000 divided by 75 = 13.333333333333333
Convert to the same units, drop the units and simplify: 1 m = 1000 mm →1 mm : 100 m = 1 mm : 100 × 1000 mm = 1 mm : 100,000 mm = 1 : 100,000 This can not be simplified any further.
Do you mean WHERE on the scale?