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Every digit in 40.725 is significant, so there are 5
In 10.00, the first significant figure is the "1", and the last significant figure is the last "0", because zeroes to the right of the decimal are significant. The two central zeroes are also significant because they are between significant figures, so 10.00 has 4 significant figures.
Measurements need to be specific so we use significant digits.
Ten significant figures(Only left -or better: leading zero's are not significant. So even in 0.0001230000000 there are 10!!)
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