How much does a kilometer equal in desameter?
You need to check your spelling there, it can't be 'desa...', it
will be either a decametre or a decimetre.
Centi- (c-) = x 0.01 (one hundredth)
Deci- (da-) = x 0.1 (one tenth)
Deca- (d-) = x 10 (ten)
Kilo- (k-) = x 1000 (thousand)
So, 1 dam is equal to 10 m, and 1 dm is equal to 0.1 m, which is
the same as 10 cm.
From that, you can see that:
1 km = 100 dam
1 km = 10,000 dm