Final answer:
To round a number to the nearest 1000, determine the digit in the thousands place and round up if the digit to its right is 5 or greater.
Step-by-step explanation:
Rounding a number to the nearest 1000 involves identifying the digit in the thousands place and determining whether to round up or down based on the digit to its right. If the digit to the right is 5 or greater, round up. If it is less than 5, round down. For example, rounding 921.996 to the nearest 1000 would yield 922.00 because the digit to the right, 9, is greater than 5.