
each of the digits of a number that are used to express
it to the required degree of accuracy, starting from the first
nonzero digit.
 All nonzero digits are
significant. ex: number 91 it has two
significant figures 9,1
123.45 it has two five significant figures
 Zeros between nonzero digits are significant
.ex:203.4506 it has nine significant figure
 Leading zeros are never
significant. ex
:0.0067 it has only twosignificant figures
 In a number with a decimal point, trailing zeros, those
to the right of the last nonzero digit, are
significant
.ex:0.00012300 it has five significant figures