The first four digits are the ones to stay; the rest become zeros and become "unsignificant". 431,801 rounded becomes 431,800.
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14.587020 rounded to four significant digits results in 14.59
The number 42.31 pounds has four significant digits.
Just one. The trailing zeros are not significant. * * * * * Not true. Integers with trailing 0s are ambiguous. You cannot differentiate between 500o as a number rounded to the nearest thousand (1 significant digit), or the nearest hundred (2 sig digits), or the nearest ten (3 sig digits) or the nearest unit (4 sig digits).
There are four significant digits in the number 6.741.
When rounded to four significant figures, 417.32 g would be 417.3 g.