The grain size of a piece of very fine sand is 0.0025 inches. What is the correct way to write the number in scientific notation?A) 2.5 × 10–3B) 2.5 × 10–2C)2.5 × 103 D)2.5×102

The grain size of a piece of very fine sand is 0.0025 inches. What is the correct way to write the number in scientific notation?

A) 2.5 × 10^–3

B) 2.5 × 10^–2

C) 2.5 × 10^3

D) 2.5×10^2

Solution:

We need to move period three places to the right to have it after the first digit. Moving to the right means the exponent will be negative. Since we moved the period three places, the exponent is -3.

We get 2.5*10^-3, A