39 tens.
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There are 39 tens in 390. 390/10 = 39
39 tens is 390.
Oh, dude, like, seriously? There are 390 tens in 3900. I mean, it's not rocket science, but yeah, that's the deal.
To round 389 to the tens place, we look at the digit in the ones place, which is 9. Since 9 is greater than or equal to 5, we round up the tens place. Therefore, 389 rounded to the tens place is 390.
390