100+390=490
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390, 000
One tenth of 390 is equal to 39. To find one tenth of a number, you divide the number by 10. In this case, 390 divided by 10 equals 39. Therefore, one tenth of 390 is 39.
394 rounded would be 390, but when you add 1, 395 is generally rounded up to 400.
How about 39*10 = 390 as one example
399 rounded to the nearest hundred is 400. 399 rounded to the nearest tens is also 400.