## 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.
128,955

Question 2.
85,639

Question 3.
9,924

Question 4.
1,194,542

Question 5.
160,656

Question 6.
149,590

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.

Question 8.
In 2000 the population of the United States was 281,421,906. Round 281,421,906 to the nearest hundred thousand.

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.
493,295 Question 10.
39,230 Question 11.
77,292 Question 12.
54,846 Question 13.
4,028

Question 14.
6,668,365

Question 15.
453,280

Question 16.
17,909

Question 17.
1,406

Question 18.
55,560

Question 19.
21,679

Question 20.
3,417,547

Question 21.
117,821

Question 22.
75,254

Question 23.
9,049

Question 24.
1,666,821

Question 25.
2,420

Question 26.
9,000,985

Question 27.
9,511

Question 28.
73,065

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.

Question 30.
Reasoning Which zoo had the greatest number of visitors?

Question 31.
Number Sense Write four numbers that round to 700 when rounded to the nearest hundred.

Question 32.
Reasoning Write a number that when rounded to the nearest thousand and hundred will have a result that is the same.

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?

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?