1k m = 1k m = 1000m；

1 m = 10 decimeter;

1 decimeter = 10/0cm;

1m = 100cm；

1 cm = 10/0mm;

1m = 1000mm。

Secondary length unit jingle:

Make it bigger and smaller, and then move it to the right. If there are several "0s" in the propulsion speed, move it several times. From small to large, moving to the left, the rate of progress has several "0", so moving a few. Rice, rice, rice is the boss, decimeter is the second child, centimeter is the third child and millimeter is the fourth child. Rice is bigger than rice. How much bigger? Is ten times; Decimeter is bigger than centimeter, how much bigger, ten times bigger; Centimeter is bigger than millimeter, how much bigger, ten times bigger.