## Envision Math 4th Grade Textbook Answer Key Topic 2.2 Rounding Whole Numbers

**Rounding Whole Numbers**

How can you round numbers?

Round 293,655,404 to the nearest thousand and to the nearest hundred thousand. You can use place value to round numbers.

**Guided Practice***

Do you know HOW?

In 1 through 6, round each number to the place of the underlined digit.

Question 1.

12__8__,955

Answer:

Question 2.

85,6__3__9

Answer:

Question 3.

__9__,924

Answer:

Question 4.

1,1__9__4,542

Answer:

Question 5.

__1__60,656

Answer:

Question 6.

__1__49,590

Answer:

Do You Understand ?

Question 7.

Writing to Explain Explain how to round a number when 7 is the digit to the right of the rounding place.

Answer:

Question 8.

In 2000 the population of the United States was 281,421,906. Round 281,421,906 to the nearest hundred thousand.

Answer:

**independent Practice**

Leveled Practice In 9 through 28, round each number to the place of the underlined digit. You may use a number line to help you.

Question 9.

49__3__,295

Answer:

Question 10.

3__9__,230

Answer:

Question 11.

77,2__9__2

Answer:

Question 12.

__5__4,846

Answer:

Question 13.

4,0__2__8

Answer:

Question 14.

6,6__6__8,365

Answer:

Question 15.

45__3__,280

Answer:

Question 16.

1__7__,909

Answer:

Question 17.

1,4__0__6

Answer:

Question 18.

5__5__,560

Answer;

Question 19.

21,6__7__9

Answer;

Question 20.

3,41__7__,547

Answer:

Question 21.

117,__8__21

Answer:

Question 22.

__7__5,254

Answer:

Question 23.

9,__0__49

Answer:

Question 24.

1,66__6__,821

Answer:

Question 25.

2,4__2__0

Answer:

Question 26.

9,0__0__0,985

Answer:

Question 27.

__9__,511

Answer:

Question 28.

73,__0__65

Answer:

Round 293,655,404 to the nearest thousand.

If the digit to the right of the rounding place is 5 or more, add 1 to the rounding digit. If it is less than 5, leave the rounding digit alone.

293,655,000

Since 4 < 5, leave the rounding digit as is. Change the digits to the right of the rounding place to zeros.

So, 293,655,404 rounds to 293,655,000.

Round 293,655,404 to the nearest hundred thousand.

The digit to the right of the rounding place is 5.

Since the digit is 5, round by adding 1 to the digit in the hundred thousands place.

So, 293,655,404 rounds to 293,700,000.

**Problem Solving**

Question 29.

For each zoo in the chart, round the attendance to the nearest hundred thousand.

Answer:

Question 30.

Reasoning Which zoo had the greatest number of visitors?

Answer:

Question 31.

Number Sense Write four numbers that round to 700 when rounded to the nearest hundred.

Answer:

Question 32.

Reasoning Write a number that when rounded to the nearest thousand and hundred will have a result that is the same.

Answer:

Question 33.

Jonas read that about 1,760,000 people will graduate from high school in California in the next four years. Jonas thinks this number

is rounded to the nearest ten thousand. What would the number be if it was rounded to the nearest hundred thousand?

Answer:

Question 34.

Liz had attended class every day since she started school as a kindergartner. She said she had been in school for about 1,000 days. What could the actual number of school days be if she rounded to the nearest ten?

Answer:

Question 35.

When rounded to the nearest ten thousand, which number would be rounded to 120,000?

A. 123,900

B. 126,480

C. 128,770

D. 130,000

Answer:

Question 36.

A fruit market sold 3,849 apples, 3,498 oranges, and 3,894 pears in one day. Write these numbers in order from greatest to least.

Answer: