Question

What is 21,800,00 written in scientific notation?

Answer 1

2.18 x 10^6

Just move the decimal to the front between the first two numbers and count how many places you moved it.

Make sure to mind your significant figures and don't put more than two digits after the decimal.

Note: You only have four zero in your question. If you meant five zeroes then your exponent changes by +1.