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SlowZasob
68,642 rounded to the nearest thousand is 69,000.

It's because 68,642 is closer to 69,000 than to 68,000.

I hope it will help you and give a clue for rounding numbers in the future ;)
The rule of rounding numbers up is if it's 5 or up, round it.  Since your number is 68,642, it would round to 69,000.  Because the 6 in the hundreds place is greater than 5.