78 million converted in scientific notation

7 * 107

Explanation:

There are 7 zeroes after the digit "7" in 70 million. (:

Scientific notation means writing the number as

"a number between one and ten multiplied by the appropriate power of ten".

In other words, how many times must you multiply 7 by 10 in order to get 70,000,000?

The answer is 7 times so the result is 7 * 107

70,000,000=7 * 10 7

78 million = 78E6, or 7.8E5.