Question

How metric units and place value units are alike and unlike

Answer 1

Well metric unit is for measurement and place value units is for numbers

Answer 2

They are alike because one kilometer is one thousand times more than one meter like one thousand is one thousand times more than one one.
1 kilometer= 1,000 x 1 meter                      1 thousand=1,000 x 1 one
  1 Liter= 1,000 x 1 milliliter                         1 ten thousand=1,000x 1 ten
1 Kilogram=1,000 x 1 gram              1 hundred thousand=1,000 x 1 hundred
They are different because metric units are for measurement/volume/mass and place value units are for counting/numbers.