Question

expresa cada medida en las unidades indicadas

Answer 1

Recordemos que:
$1\,km=1000m\\1\,hm=100\,m\\1\,dam=10\,m\\1\,m=100\,cm$
Luego:
$(3\,km)(\frac{1000\,m}{1\,km})=3000\,m\\(3000\,m)(\frac{1\,hm}{100\,m})=30\,hm\\(3000\,m)(\frac{100\,cm}{1\,m})=300000\,cm$
$(35\,dam)(\frac{10\,m}{1\,dam})=350\,m\\(350\,m)(\frac{1\,hm}{100\,m})=3.5\,hm\\(350\,m)(\frac{1\,dm}{0.1\,m})=3500\,dm$
Saludos.