You would normally round 3.7994 up to 4 as it is the nearest whole number.
3 + 0.7994 = 3.7994
4 - 0.2006 = 3.7994
0.7994 is bigger than 0.2006 so 3.7994 is closer to 4 than 3.
I might "rather" round it down than up but normal practice in most situations is to round to the nearest whole number.
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You would round it down to 49000.
395 would round up to 400. 394 would round down to 390.
You would round DOWN to 7000.
It means you should take your answer and round it up or down to the nearest multiple of ten. and number that ends in 1,2,3,4 you round down and any number ending in 5,6,7,8,9 you round up. for instance . . . 13 ends in a 3 and would round down to 10. 18 ends in an 8 and would round up to 20. 775 ends in a 5 and would round up to 780. 1282 ends in a 2 and would round down to 1280. Hope that helps.
You would round it down to 140.