because they're place holders
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Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Three. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero integers are significant and zeros in between significant digits are significant.
The number 12.300 has five significant digits. The nonzero digits (1, 2, and 3) are all significant, as well as the zero after the decimal point. Zeros between nonzero digits (like the zero after the decimal point) are also considered significant.