how do you round to the correct number of significant figures?

Question

for example: 37.26, 0.0015

Answer 1

How many sig. figs. do you want.

37.26 has 4 sig. figs. Rounded to 3 it will be 37.3; rounded to 2 it will be 37 and rounded to 1 it will be 40

0.0015 has 2 sig. figs. Rounded to 1, it will be 0.002