Oh, dude, you're really making me do math right now? Okay, fine. 7.81 rounded to the nearest tenth of a second is 7.8. But seriously, who's counting tenths of a second anyway? Like, just round it to the nearest whole number and call it a day.
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78.3333
999 + 781 = 1780
781/1000 is already in its simplest form
781/1,000 is.
Expressed as a decimal, -781 13/50 is equal to -781.26.