Respuesta :

1km = 1000m

1m = 100m
1000m = 1000  x 100cm
1000m = 100 000cm

1cm = 10 mm
100 000 cm = 100 000 mm x 10mm
100 000 cm = 1000 000  mm

therefore 1km = 1000 000mm

From Kilometers to Millimeters is 1000000x
So From Millimeters to Kilometers is x/100000?
Idk 
Hope That Somehow Helped