From given options:
Meter (m) is the largest in size
1 Decimeter (dm) = 1/10 of a meter = 0.1 m
1 Centimeter (cm) = 1/100 of a meter = 0.01 m
1 Millimeter (mm) = 1/1000 of a meter = 0.001 m
Therefore the increasing order of size would be:
mm < cm < dm < m
