What are the rules for determining the number of significant figures in answers involving:
(i) addition or subtraction
(ii) multiplication or division
(iii) calculations involving a number of steps?

Compute the following keeping in view the proper number of significant figures:

Express the result of the following calculations to the appropriate number of siginficant figures:

Express the result of the following calculations to the appropriate number of siginficant figures:

Express the result of the following calculations to the appropriate number of siginficant figures:

How many significant figures should be present in the answer of the following calculations?

How many significant figures should be present in the answer of the following calculations?

How many significant figures should be present in the answer of the following calculations?

The population of India according to 1981 census figure was 68.4 crores. Express it in scientific notation.

Calculate the area of a rectangle whose length is 6.00 m and breadth 5.2 m. Express the result to a proper number of significant figures.