how to write 1,030,000 in scientific notation

Scientific notation is used to condense numbers that are too large or to expand numbers that are too big. For your example 1,030,000: you could say there are one million 30 thousand cells in the petri dish or you could say that there are 1.03 X 10^6 cells (by moving the decimal point to the left 6 places.)

You may also have to keep in mind if you need to convert and amount of something into something else using the metric system. For example, if you want to know what 1,030,000 grams is in milligrams, it would be 1030 x 10^3 milligrams, or likewise it would be 1.03 X10 ^6 micrograms.