How many significant figures does 22.0, 0.22, 22. , 0.022?

Question

Im just confused as to the decimal addition to numbers and what the sig figs will be for them.

If you don't mind can you please state some rules for sig figs that are helpful and some confusing rules as well and pretty please with a cherrry on top, some examples???? Im a chemistry Student by the way.

THNAK YOU!!!!!!! ;^)

Answer 1

Here is a good site?
http://www.chemteam.info/SigFigs/SigFigs.html

Zeros before the number don't count. zeros after the decimal point count. Zeros between two numbers count.
0.22 has two.
220.0 has four.
202 has three.

Answer 2

22.0 has 2 significant figures

Answer 3

22.0 has three
0.22 has two
22 has two
0.022 has two
0.00000000223 has three

Answer 4

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