Question

does anyone know how to round to significant figures?

Answer 1

Significant figures are the first non zero figures in a number.
Example the follwing numbers are rounded to 3 sf

217 is 220 (round as you would for decimal places but keep the important zero place holder.
23.4 is 23 as the 4 does not round up

0.00216 is 0.0022 again rounding at the end but the first zeros are important place holders

Answer 2

Sorry they are reduced to 2 sf

Answer 3

thanks :D