Question

express this number in scientific notation. 78 million

Explanation:

Step1: Write 78 million as a number

78 million = 78000000

Step2: Convert to scientific - notation

Scientific notation is of the form $a\times10^{n}$, where $1\leqslant a<10$ and $n$ is an integer. For 78000000, $a = 7.8$ and $n = 7$ since we move the decimal point 7 places to the left. So, $78000000=7.8\times 10^{7}$

Answer:

$7.8\times 10^{7}$