1m=.001km, because there are 10 meters in dekameter, 100 in hecta and 1000 in kilo.

There are 10 milimeters in a centimeter, 10 centimeters in a decimeter and 10 decimeters in a meter. It is the same with all SI(metric) units

So, if you go from mm to cm, you move the decimal to the right, making the number bigger.

From Km to mm, to the left however many spaces(6 in this case), to make it smaller.

Kilo Hecto Deca STANDARD Deci Centi Mili

King Henry Died STANDARD Drinking Chocolate Milk

For example, 1 m= __ km

You write 1 m by 1(m is standard), and from meter(standard) to kilometer, it’s 3 places to the left, so you move the decimal in 1. 3 places to the left and get 1m=.001 km