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sigfig(expr0,expr1) ⇒ string
The sigfig() function returns the rounded value of the first argument rounded to the number of significant figures specified by the second argument.
Negative, zero and fractional values of the expr1 parameter, that is, the number of significant figures, should not be used because they give unexpected results.
The significant figures of a number are digits that carry meaning contributing to its measurement resolution.Wikipedia
With the latest version of the Formulas question type (4.81 for Moodle 3.0 to 3.5, build 2018080300), the function sigfig() does not display trailing zeros, but it will in an upcoming version.
Use the calculator at the top right of the window to round a number to the desired number of significant figures. Note that this calculator displays trailing zeros.
Scroll up or down to the Round to Significant Figures calculator: