## Envision Math 3rd Grade Textbook Answer Key Topic 2.3 Rounding 4-Digit Numbers

**Rounding 4-Digit Numbers**

How can you round four-digit numbers?

Answer:

The table shows ticket sales for two sports games. To the nearest thousand, about how many tickets were sold for the baseball game?

Question.

Round 2,379 to the nearest thousand to find out.

Answer:

**Guided Practice**

**Do you know HOW?**

Round to the nearest hundred.

Question 1.

4,569

Answer:

Question 2.

2,310

Answer:

Question 3.

9,992

Answer:

Round to the nearest thousand.

Question 4.

4,737

Answer:

Question 5.

8,333

Answer:

Question 6.

4,099

Answer:

Question 7.

3,914

Answer:

Question 8.

1,111

Answer:

Question 9.

6,274

Answer:

**Do you UNDERSTAND?**

Question 10.

How does the halfway number on the number line help you round 2,379?

Answer:

Question 11.

**Writing to Explain** Describe how to round 2,379 to the nearest hundred.

Answer:

Question 12.

In the example above, about how many tickets were sold for the football game, to the nearest hundred? to the nearest thousand?

Answer:

**Independent Practice**

For 13–22, round to the nearest hundred.

Question 13.

3,708

Answer:

Question 14.

5,542

Answer:

Question 15.

7,356

Answer:

Question 16.

8,929

Answer:

Question 17.

6,991

Answer:

Question 18.

4,008

Answer:

Question 19.

7,890

Answer:

Question 20.

6,555

Answer:

Question 21.

3,945

Answer:

Question 22.

9,961

Answer:

For 23–32, round to the nearest thousand.

Question 23.

2,774

Answer:

Question 24.

3,870

Answer:

Question 25.

5,077

Answer:

Question 26.

7,299

Answer:

Question 27.

8,603

Answer:

Question 28.

6,905

Answer:

Question 29.

8,500

Answer:

Question 30.

4,099

Answer:

Question 31.

2,495

Answer:

Question 32.

9,573

Answer:

**One Way**

You can use a number line to round.

2,379 is closer to 2,000 than to 3,000.

2,379 rounds to 2,000.

About 2,000 tickets were sold for the baseball game.

**Another Way**

You can use place value to round.

- Find the digit in the rounding place.
- If the next digit to the right is 5 or greater, increase the digit in the rounding place by 1. If the next digit is less than 5, keep the digit in the rounding place as it is.
- Change all the digits to the right of the rounding place to zero.

So, 2,379 rounds to 2,000.

About 2,000 tickets were

sold for the baseball game.

**Problem Solving**

In 33–36, write a number that rounds to the number given. Use all four of the digits at the right once in each answer.

Question 33.

4,000

Answer:

Question 34.

6,000

Answer:

Question 35.

5,500

Answer:

Question 36.

5,400

Answer:

Question 37.

The Golden Gate Bridge is 4,200 feet long. What is 4,200 rounded to the nearest thousand?

Answer:

Question 38.

**Writing to Explain** Describe the steps you would follow to round 3,647 to the nearest hundred.

Answer:

Question 39.

**Number Sense** Write a number that rounds to 7,000 when it is rounded to the nearest thousand.

Answer:

Question 40.

In 1 hour, an adult’s heart beats about 4,320 times.

a. To the nearest thousand, about how many times does an adult’s heart beat in one hour?

b. To the nearest hundred, about how many times does an adult’s heart beat in one hour?

Answer:

Question 41.

Which number rounds to 5,000 when it is rounded to the nearest thousand or to the nearest hundred?

A. 4,895

B. 5,029

C. 5,170

D. 5,956

Answer: