1408 is four significant figures.
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1408 has four significant figures. Significant figures are the digits in a number that carry meaning contributing to its precision. In this case, all four digits (1, 4, 0, and 8) are considered significant. Zeros between non-zero digits (like the zero in 1408) are also significant.
4 of them.
3 significant figures.
8.09 has three significant figures.
It has three significant figures.