Two significant figures, 6 and 7.
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There are 4 significant figures in this number.
3 of them.
There are 2 significant figures in this measurement.
There are 3 significant figures
The number 210 has two significant figures. In scientific notation, it would be written as 2.1 x 10^2 to explicitly show the two significant figures. Significant figures are the digits in a number that carry meaning contributing to its precision and accuracy. In this case, the digits 2 and 1 are considered significant in the number 210.