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First of all, you have to have a scientific calculator, one that supports scientific notation. (As far as I know, all scientific calculators do.) The scientific calculator should have a special key labelled something like EXP. To input (for example) 2.3 million, you would type 2.3 EXP 6 (where EXP is short for "times 10 to the power...").
e-r diagram of scientific calculator
A scientific calculator.
Go to [See related link "Scientific Calculator" below] for a sig fig calculator and interactive tutorial on significant figures with practice exam.
On most calculator there's a 'ENG' key