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

(3*2nd+8)/(5.4*2nd+14)