What is 5,812 rounded to the nearest Thousand?

We look at the last digit to keep

Increase it by 1 if the next digit is 5 or more (this is called rounding up)

Leave it the same if the next digit is less than 5 (this is called rounding down).

We have 5,812

Look at digit of thousand. It's 5. Next digit is 8 ≥ 5. Therefore digit of thousand increase by 1.

Answer: 6,000