3rd Grade Rounding to the Nearest 10 and 100 Worksheets with Answers (Free PDF)

3rd grade rounding worksheet – Maths PDF

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This 3rd grade rounding worksheet covers rounding to the nearest 10 and 100 (Common Core 3.NBT.A.1), with a free PDF to print.

Key takeaway: This worksheet helps Grade 3 students practice rounding to the nearest 10 and the nearest 100.

Topic: Rounding to the Nearest 10 and 100 (3rd grade)
Content: 24 worksheet problems, from easy to challenging
Standards: 3.NBT.A.1
Answers: On a separate page, so you can try every worksheet problem first
Format: Free printable PDF, US Letter, black and white

This worksheet helps Grade 3 students practice rounding to the nearest 10 and the nearest 100. First, children use number lines to round down, round up, and round numbers at the halfway point. Then they round lists of numbers.

The problems also round numbers that cross into a new hundred, find which ten is closer, and round the same number to both places. Next, children explain a halfway choice and find numbers in a range. Finally, they solve short stories and estimate sums. Plan about 25 minutes, and keep a number line nearby.

These problems practice rounding whole numbers to the nearest 10 and the nearest 100 using place value and number lines (Common Core 3.NBT.A.1). You will round, find the least and greatest numbers in a range, fix mistakes, and estimate with real stories about crowds, trips, and libraries.

Grade 3 · Common Core State Standards: 3.NBT.A.1

3rd grade rounding worksheet: worksheet problems 1 to 10

1 – Down to the nearest ten

63 is before the halfway point 65.

First, use the number line to round 63 to the nearest ten.

2 – Up to the nearest ten

78 is at or past the halfway point 75.

Next, use the number line to round 78 to the nearest ten.

3 – Halfway number

45 is at or past the halfway point 45.

Then, the number 45 is halfway between 40 and 50. Round 45 to the nearest ten.

4 – Four tens

Now, round each number to the nearest ten: \(27\), \(52\), \(89\), \(94\).

5 – Down to the nearest hundred

372 is at or past the halfway point 350.

Also, use the number line to round 372 to the nearest hundred.

6 – Stay at the hundred

418 is before the halfway point 450.

First, use the number line to round 418 to the nearest hundred.

7 – Halfway hundred

Next, round 250 to the nearest hundred. Explain your choice.

8 – Four hundreds

Then, round each number to the nearest hundred: \(149\), \(583\), \(761\), \(899\).

9 – Tens in the hundreds

Now, round each number to the nearest ten: \(346\), \(658\), \(705\), \(999\).

10 – Round up to 100

Also, round 96 to the nearest ten and to the nearest hundred.

Worksheet problems 11 and up

11 – Round up to 1,000

First, round 962 and 991 to the nearest hundred.

12 – Both roundings

Look at the ones digit for tens, and the tens digit for hundreds

Next, round 684 to the nearest ten and to the nearest hundred.

13 – Which ten is closer?

Where is 86?

Then, how far is 86 from 80? How far is it from 90? Round 86 to the nearest ten.

14 – Numbers that round to 70

The shaded numbers all round to 70.

Now, the shaded numbers on the line round to 70 when rounded to the nearest ten. Write the least and the greatest of these numbers.

15 – Numbers that round to 500

Also, find the least and the greatest whole numbers that round to 500 when rounded to the nearest hundred.

16 – Find the error

Ben rounds 349 to the nearest hundred. He says, “The 9 rounds up, so the answer is 400.” Explain his mistake and give the correct answer.

17 – Missing digit

Next, the number 4_7 has a missing tens digit. It rounds to 500 when rounded to the nearest hundred. Which digits could be in the blank?

Worksheet problem 18 and after

18 – Compare roundings

Then, round 645 to the nearest ten and to the nearest hundred. Which rounded number is greater?

19 – Soccer crowd

Now, a soccer game has 438 fans. Round the number of fans to the nearest ten and to the nearest hundred.

20 – Farm stand estimate

Also, a farm stand sold 187 apples and 214 pears. Round each number to the nearest hundred to estimate the total number of pieces of fruit. Then find the exact total.

21 – Road trip estimate

First, a family plans a 468-mile road trip. They have driven 289 miles. Round each number to the nearest ten to estimate how many miles are left. Then find the exact number.

22 – Library books

Next, the school library has 372 picture books and 295 chapter books. Estimate the total two ways: round to the nearest hundred, and round to the nearest ten. Then find the exact total. Which estimate is closer?

23 – Is the estimate right?

Then, on Friday, 126 tickets were sold. On Saturday, 158 tickets were sold. Priya rounds to the nearest hundred and says about 400 tickets were sold. Is she right? Find a better estimate.

24 – Fair attendance

Now, a sign at the county fair says that about 700 people came on Sunday. The number was rounded to the nearest hundred. What is the least and the greatest number of people that could have come?

Key facts behind this 3rd grade rounding worksheet

Key facts

Rounding to the nearest 10 depends on the ones digit.
Rounding to the nearest 100 depends on the tens digit.
A digit of 5 or more rounds up. A digit of 4 or less rounds down.
Then, a number exactly halfway rounds up, so 45 rounds to 50.
Rounded numbers make quick estimates for sums and differences.

Common mistakes with this 3rd grade rounding worksheet

When rounding a number like 65 to the nearest ten, students write 60. Because the ones digit is 5, round up to 70.
Also, when rounding to the nearest hundred, students look at the ones digit. Look at the tens digit instead. As a result, small mistakes are easier to catch.
When a number has 9 in the tens place, students forget the hundreds digit changes. For example, 396 rounds to 400.

Tips before you start the worksheet problems

Mark the halfway point on the number line before you round. Then see which side the number is on. Also, saying the steps aloud helps you spot a slip.
Underline the digit you must check. Also circle the place you are rounding to. Then check the result once more before moving on.
Teachers can ask students to explain why a halfway number rounds up. A short explanation shows understanding of the rule.

Download the 3rd grade rounding worksheet as a PDF with the button below and keep it with your notes.

3rd grade rounding worksheet: frequently asked questions

What is the least whole number that rounds to a given hundred?

It is the halfway point. For example, 150 is the least whole number that rounds up to 200, because numbers from 150 to 249 round to 200. Numbers below 150 round down to 100. In other words, slow and careful work pays off here.

How do you round a number to the nearest ten and the nearest hundred?

Use two steps. For the nearest ten, look at the ones digit. Also, for the nearest hundred, look at the tens digit. For example, 463 rounds to 460 for tens and 500 for hundreds. The results can differ.

How do you tell which ten a number is closer to?

Find the two tens on either side and the halfway point between them. If the number is less than the halfway point, it is closer to the lower ten. If it is at or past the halfway point, round up.

All Grade 3 chapters: Grade 3 math.

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