Question

800000 how many significant figure.....

Answer 1

Only one significant figure.
8

All the trailing zeroes are not counted because there is no decimal point.



Rule 1: Non-zero digits are always significant.

Rule 2: Any zeros between two significant digits are significant.

Rule 3: For numbers with decimal points, zeros to the right of a non zero digit are significant. Thus 6.00 has three significant figures and 0.050 has two significant figures. For this reason it is important to keep the trailing zeros to indicate the actual number of significant figures.

Rule 4:For numbers without decimal points, trailing zeros may or may not be significant. Thus, 400 indicates only one significant figure. To indicate that the trailing zeros are significant a decimal point must be added. For example, 400. has three significant figures.