Six - zeros between significant digits are significant.
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Integers ending in 0 are ambiguous cases. If measured to the nearest 10 kg, this has 2 sig figs, but if measured to the nearest kg, it has 3 sig figs.
There are four significant figures in 41.05 kg. The 4, 1, 0, and 5 all contribute to the precision of the measurement.
There are two significant figures in the measurement 3300g.
There are 4 significant figures in 9.0170. They are the 9, 1, 7, and the second 0.
You can lift a 20 kg weight over your head ten times before getting tired (20 kg, 10 times). This answer is accurate to two significant figures.
230 mg = 0.00023 kg