Answer
$6.78\times10^{5}$
Work Step by Step
We are given the number $678,000$.
Step 1: To write this number in scientific notation, we move the decimal point to the left until the original number is 6.78.
Step 2: Since the original number was greater than 10, we moved the decimal by 5 positive places. In other words, we will raise 10 to a power of 5.
Now, we write the product of the two numbers found in Step 1 and Step 2.
$6.78\times10^{5}$