The document discusses different methods of rounding numbers, including: - Rounding to the nearest ten, where numbers end in 5 or greater are rounded up and less than 5 are rounded down. - Rounding decimals to a specified number of decimal places by counting places from the decimal point. - Rounding to a specified number of significant digits by counting digits from left to right and rounding off from there, with 5 or greater rounding up. Leading zeros in numbers are not counted as significant digits. Examples are provided to illustrate each rounding method.