A leading zero is any 0 digit that comes before the first nonzero digit in a number string in positional notation. For example, James Bond’s famous identifier, 007, has two leading zeros. When leading zeros occupy the most significant digits of an integer, they could be left blank or omitted for the same numeric value.

All non-zero digits are considered significant. For example, 91 has two significant figures (9 and 1), while 123.45 has five significant figures (1, 2, 3, 4, and 5). Zeros appearing between two non-zero digits (trapped zeros) are significant. Example: 101.12 has five significant figures: 1, 0, 1, 1, and 2.

We round a number to three significant figures in the same way that we would round to three decimal places. We count from the first non-zero digit for three digits. 0.0020499 to three significant figures is 0.00205. We do not put any extra zeros in to the right after the decimal point.

✓ 0.001050 has 4 significant figures. 1.050 x 10-3 • Zeros at the end of a number without a written decimal point are ambiguous and should be avoided by using scientific notation. ✓ If 150 has 2 significant figures, then 1.5 x 102, but if 150 has 3 significant figures, then 1.50 x 102.

The trailing zero(s) in number with a decimal point are significant. Thus, 3.800 kg has 4 significant figures. 6. A choice of change of units does not change the number of significant digits or figures in a measurement.

The metric system is the preferred system of scientific units for several reasons: The majority of countries in the world employ the metric system of measurement. Because metric units are decimal-based, they are easily converted by moving the decimal point.

9.000 m is the most accurate measurement as it is most precise among the given options.