## 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: