How do you write 0.0024 in scientific notation?

0.000000025 = 2.5 × 10^-8

To convert a number to scientific notation:

1. write out the number starting with the first non-zero digit and continue until the last non-zero digit;
2. put the decimal point after the first digit;
3. count how many digits the decimal point needs to move to get back to where it was originally (if there was no decimal point as the number was a whole number it was "hiding" after the ones-digit, the last digit);
4. if the decimal point need to move left make this count negative;
5. write ×10 to the power of this count after the number written in step 2.

→ 0.000000025 = 2.5 × 10^-8