Answer: 454000
Step-by-step explanation: Note that the thousands place is four moves to the left of the decimal point (if it exists). To round to the nearest thousand (nearest 1000), we use the hundreds place to determine whether the thousands place rounds up or stays the same.
Step 1: Locate and underline the thousands place (3) then look at the digit to the right (6):
453605
Step 2: In this case, the digit to the right (6) is 5 or above. So, we add 1 to the thousands place (3). The digit(s) after the (3) are replaced by zeros (or dropped). Thus, we get 454000 as the answer.
In short: 453605 rounded to the nearest thousand is 454000.