Three - all non-zero numbers are significant.
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Four - zeros between significant digits are significant.
Significant digits are digits that provide useful information, for instance 123 has 3 significant digits and 30010 has 4 significant digits. So basically zeros aren't significant unless they are between two other numbers. 0.1020 has only 4 significant digits. A+: 4
It has 4 significant figures.0.007080 has four significant digits.
2 significant figures.
Leading zeros are not significant digits, therefore 007 has one.