This grade 3 rounding worksheet gives 24 problems on rounding to the nearest 10 and 100, ordered from easy to hard, with a separate answer key.
These 24 problems practice rounding whole numbers to the nearest 10 and the nearest 100 for standard 3.NBT.A.1. You will use number lines, place value, and the halfway rule.
Start with the easier problems and finish with word problems about estimating.
Grade 3 Rounding Worksheet: problems 1–5
Problem 1: Round to the nearest 10, ones digit small
Round \(23\) to the nearest 10.
Problem 2: Round to the nearest 10, ones digit large
Round \(58\) to the nearest 10.
Problem 3: Four numbers to the nearest 10
Round each number to the nearest 10.
- \(71\)
- \(76\)
- \(74\)
- \(79\)
Problem 4: Halfway numbers
Round each number to the nearest 10.
- \(45\)
- \(85\)
- \(135\)
Problem 5: Which ten is closer?
Jamal marks 83 on a number line. Which multiple of 10 is closer to 83?
Grade 3 Rounding Worksheet: problems 6–10
Problem 6: Three-digit numbers to the nearest 10
Round each number to the nearest 10.
- \(142\)
- \(367\)
- \(505\)
- \(996\)
Problem 7: Round to the nearest 100
Round each number to the nearest 100.
- \(312\)
- \(689\)
- \(450\)
- \(950\)
Problem 8: Hundreds on a number line
Maya plots 640 on a number line. Round 640 to the nearest 100.
Problem 9: Rounding 99 to the nearest 10
Round 99 to the nearest 10. Explain why the tens digit changes from 9 to a different place.
Problem 10: Complete the rounding table
Copy and complete the table.
| Number | Nearest 10 | Nearest 100 |
|---|---|---|
| 276 | ? | ? |
| 543 | ? | ? |
| 805 | ? | ? |
| 99 | ? | ? |
Grade 3 Rounding Worksheet: problems 11–15
Problem 11: Numbers that round to 40
Ethan lists the numbers 31, 34, 35, 38, and 41. Which of them round to 40 when rounded to the nearest 10?
Problem 12: Smallest and greatest
What are the smallest and the greatest whole numbers that round to 60 when rounded to the nearest 10?
Problem 13: Range for 300
A number rounds to 300 when rounded to the nearest 100. What are the smallest and greatest whole numbers it could be?
Problem 14: Find the mistake: hundreds
Liam says that 465 rounds to 400 when rounded to the nearest 100. Is he right? Explain.
Problem 15: Two different roundings
Noah rounds 248 to the nearest 10 and gets 250. Then he rounds 248 to the nearest 100 and gets 200. Explain why the answers are different.
Grade 3 Rounding Worksheet: problems 16–20
Problem 16: Round and compare
Round 548 and 652 to the nearest 100. Then write <, >, or = between the rounded numbers.
Problem 17: Estimate a sum
Estimate 38 + 47 by rounding each number to the nearest 10.
Problem 18: Estimate a difference
Estimate 683 − 216 by rounding each number to the nearest 100.
Problem 19: Road trip miles
The Rivera family drove 237 miles on a road trip. Round the distance to the nearest 10 miles and to the nearest 100 miles.
Problem 20: Bake sale estimate
The school bake sale raised $153 on Saturday and $248 on Sunday. Estimate the total by rounding each amount to the nearest $100. Then find the exact total.
Grade 3 Rounding Worksheet: problems 21–24
Problem 21: Can drive
Jamal’s class collected 482 cans and Mei’s class collected 317 cans. Round each number to the nearest 100 to estimate how many more cans Jamal’s class collected.
Problem 22: Game attendance
A Little League sign says, “About 600 fans came to the game.” The number was rounded to the nearest 100. What are the least and the greatest numbers of fans that could have come?
Problem 23: Pages read
Sofia read 38 pages on Monday, 47 pages on Tuesday, and 52 pages on Wednesday. Round each number to the nearest 10 to estimate her total.
Problem 24: Is Ethan right?
Ethan says that 351 rounds to 400 when rounded to the nearest 100 because 51 is more than 50. Is he right? Explain.
How to use this grade 3 rounding worksheet
Print this grade 3 rounding worksheet as a PDF, solve every problem on paper, then compare with the answer key.
See every chapter on the Grade 3 math page.
