Question

how can I express 2 dm in millimeters

Answer 1

use conversion that.... 1 meter = 10 decimeters (dm) = 100 centimeters (cm) = 1000 millimeters (mm)

Answer 2

from the conversion above...\[10~dm=1000~mm\]or\[1~dm=100~mm\]therefore\[2~dm=200~mm\]