Give the number of significant figures in this number: 7.8 x 10¹²

Solution:

The number 7.8 x 10¹² can be written as:

 7.8 x 10¹² = 7800000000000

The number of significant figures in this number is 13 i.e. the digits 7, 8, and eleven zeroes.

Similarly the number of significant digits in 3.8 x 10⁸ can be found out by writing number in the elaborate form:

3.8 x 10⁸ = 380000000

The number of significant figures in the above number are 9 i.e. 3, 8 and seven zeroes

Give the number of significant figures in this number: 7.8 x 10¹²

Summary:

The number of significant figures in this number: 7.8 x 10¹² is 13