Va roooooog!!! Repede!!!

e) 680g-12dag=?g 12dag=120g
680g-120g=560g
f)68hg-100dag=?dag 68hg=680dag
680dag-100dag=580dag
g) 47kg-210dag=?hg 47kg=470hg
210dag=21hg
470hg-21hg=449hg
h)300cg-12dg=?dg 300cg=30dg
30dg-12dg=18dg
^-^