Rounding Decimals by Significant Figures

To round decimals by significant figures, locate the required number of significant digits,

draw a line after the last one, and check the next digit to its right to decide whether

to round up or keep it the same. If the digit is 5 or greater, round up the last

significant digit; otherwise, keep it the same. Finally, fill in any necessary

placeholder zeros before the decimal point to maintain the number's magnitude, but drop any digits

or zeros after the decimal point that are no longer needed.