1. Move the decimal point to the right until you have a number between 1 and 10. In this case, we need to move the decimal point two places to the right, giving us 2.4.

2. Count the number of places you moved the decimal. Since we moved it two places to the right, our exponent will be -2.

3. Write the number in the form a x 10^b. In this case, it's 2.4 x 10^-2.