Question

lesson check (4.nbt.3)

1. what is 247,039 rounded to the nearest thousand?
2. to the nearest ten thousand, the population of vermont was estimated to be about 620,000 in 2008. what might have been the exact population of vermont in 2008?

spiral review (reviews 3.nf.1, 4.nbt.2)

1. write the symbol that makes the following number sentence true?
2. pittsburgh international airport had approximately 714,587 passengers in august 2009. write a number that is greater than 714,587.

Explanation:

Step1: Identify the rounding - digit

For 247,039, the digit in the thousands place is 7.

Step2: Look at the digit to the right

The digit to the right of 7 (in the hundreds place) is 0. Since 0 < 5, we keep the digit in the thousands place as it is and change all the digits to the right to 0. So 247,039 rounded to the nearest thousand is 247,000.

Step3: Analyze the population - estimation problem

If the estimated population of Vermont in 2008 was about 620,000, the exact population could be any number in the range that rounds to 620,000. For example, numbers from 615,000 (inclusive) to 624,999 (inclusive) would round to 620,000.

Step4: Find a number greater than 714,587

A number greater than 714,587 could be 714,588.

Answer:

1. 247,000
2. Any number from 615,000 to 624,999 could be the exact population.
3. 714,588 (one possible answer)