Intro to scientific notation

A number in the form $a\times10^n$  

Where a starts with the ones place

Which of these is in scientific notation?

I was born in Texas

Population: 29 million

How do we write this in scientific notation?

Population: 29 million

29,000,000

 $2.9\times10,000,000$  

 $=2.9\times10^7$  

Or, move the decimal 7 places on 2.9

Population 6.046 million

How do we write this in scientific notation?

Population 6.046 million

 $6.046\times1,000,000$  

 $=6.046\times10^6$