Question

how do you write 840 in scientific notation?
× 10

Explanation:

Step1: Move decimal point

Move the decimal point in 840 to get a number between 1 and 10. So, $840 = 8.4\times100$.

Step2: Express 100 as power of 10

Since $100 = 10^{2}$, then $840=8.4\times10^{2}$.

Answer:

$8.4\times 10^{2}$