Conversion of units

Hi everyone,welcome to Maths PlayGround,
Today I will be talking about conversion of units.Conversion of units means changing units of different measurements.

For example
100cm=1m
10cm=1dm(decimetre)
45cm=0.45m
456g=0.456kg
45ml=0.045L
Take Note:ATTENTION!PLEASE NOTE THAT some people might be careless and convert it to 0.45l which is WRONG.
For a table of conversion of units,you may visit this website:
http://en.wikipedia.org/wiki/Conversion_of_units

After seeing some examples,lets do a short exercise.

Q1 .67ml=?l
Q2.55g=?kg
Its getting more and more difficult......
Q3.35micrometre=?m
Q4.0.61nanograms=?grams
That's all,hope you all can understand:)