Have you learned the scientific counting method? (","are separated by commas for convenience, not commas. . . . )

Area: 1m? = 1，000dm？ = 1，000，000cm？ =1.0 million mm?

Weight:1t =1000kg =100000g =1000000mg.

Time: 1h = 60min = 3600s One year = 12 months =365 (leap year 366) days =24 hours.

Rmb: 1 yuan = 10 minute = 100 minute.

Below is the unit.

m？ square meter

dm？ Square DM

cm？ Square centimeter

Hmm? square millimeter

ton

Kg kg

scold or beat

Mg mg

H hours

Minmin

S seconds