Answer:To round the number 923,451 to the nearest hundred thousand, we need to look at the digit in the hundred thousand place, which is the 9 in this case. - If the digit in the ten thousand place (2 in this case) is 5 or greater, we round up the hundred thousand place.- If the digit in the ten thousand place is less than 5, we keep the hundred thousand place as it is. In the number 923,451, the digit in the ten thousand place is 2, which is less than 5. Therefore, we keep the hundred thousand place (9) as it is. So, when rounded to the nearest hundred thousand, 923,451 remains as 900,000.