1/10000
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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
0.1 km is 1/10 as a fraction
The kilo- prefix means 1,000 The milli- prefix means 1/1000 → 1 mm = 1/1000 m → 1,000 mm = 1 m 1 km = 1,000 m = 1,000 × 1,000 mm = 1,000,000 mm → ½ km = 0.5 × 1,000,000 mm = 500,000 mm
100 m is a tenth of a kilometre.
4 mm is 1/10 of 4 cm.