Significant Figure

1. Significant figures are the relevant digits in an integer or a decimal which is rounded off to a certain degree of accuracy.

2. Rules of finding out the number of significant figures in a given number :

a. All non-zero digits are significant.

Example :

5.671 ( 4 significant figures )

534 ( 3 significant figures )

b. Zeros between non-zero digits are significant.

Example :

6.003 ( 4 significant figures )

8700005 ( 7 significant figures )

c. Zeros after a non-zero digit in a decimal are significant.

Example :

6.300 ( 4 significant figures )

0.008700 ( 4 significant figures )

d. Zeros before a non-zero digit in a decimal are not significant.

Example :

0.00063 ( 2 significant figures )

0.000870 ( 3 significant figures )

e. Zeros after a non-zero digit in a whole number may or may not be significant, depending on the

Example :

6237 = 6000 ( 4 significant figures )

6237 = 6000 ( 4 significant figures )

3. Rounded numbers are approximations.

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## Thursday, January 10, 2008

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