Question

Which is greater a) 2.5 × 10^5 b) 7.4 × 10^-5

Answer 1

Option a) i.e. 2.5 X 10^5 is greater because in this the answer is 2.5 X 100000 and hence, the answer is 250000.

And in the second part the number 10 has exponent -5 which means it is going to be in decimal and hence, the answer will be a small decimal number.

From this we can clearly see that the option a) is greater.

Answer 2

The greater one is: (a)

Explanation:
2.5*10^5 = 25*10000

And,
7.5*10^-5= 75*1/10000

Thus, (a) is greater

Hope it helps