Physics nd the TI84 Calculator

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Could someone remind me how to calculate this on the TI-84 Calculator:


Which buttons do I hit for this:
3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21

It should come out to be 5.55 *10^-7 but I'm not doing the input correct
Please help

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