This grade 4 rounding worksheet answer key solves all 22 problems of the rounding multi-digit numbers worksheet step by step.
Each rounding problem is solved here with the rounding place, the digit to its right, and the final answer. Check your work against the steps, not only the answer. Number lines show why numbers round up or down.
Grade 4 Rounding Worksheet Answer Key: problems 1–5
Problem 1: Nearest ten on a number line
63 is between 60 and 70. The halfway mark is 65. Since 63 is less than 65, it is closer to 60.
63 rounds to 60.
Problem 2: Halfway rounds up
The tens digit is 8. The digit to its right is 5, so round up. The 8 becomes 9. 85 is exactly halfway between 80 and 90, and halfway numbers round up.
90
Problem 3: Round to the nearest ten
The tens digit is 8. The digit to its right is 2, which is 4 or less, so the 8 stays. The ones digit becomes 0.
480
Problem 4: Nearest hundred
The hundreds digit is 4. The digit to its right is 8, which is 5 or more, so the 4 becomes 5. The tens and ones become zeros.
482 rounds to 500.
Problem 5: Hundreds in a four-digit number
The hundreds digit is 6. The digit to its right is 4, so the 6 stays. The tens and ones become zeros.
3,600
Grade 4 Rounding Worksheet Answer Key: problems 6–10
Problem 6: Nearest thousand
The thousands digit is 3. The digit to its right is 6, which is 5 or more, so the 3 becomes 4. The hundreds, tens, and ones become zeros.
3,649 rounds to 4,000.
Problem 7: Exactly halfway
The thousands digit is 7. The digit to its right is 5, so round up. 7,500 is halfway between 7,000 and 8,000, and halfway rounds up.
8,000
Problem 8: Nearest ten thousand
The ten thousands digit is 2. The digit to its right is 5, so the 2 becomes 3. Every digit after it becomes 0.
30,000
Problem 9: Thousands in a five-digit number
The thousands digit is 8. The digit to its right is 2, so the 8 stays. The hundreds, tens, and ones become 0.
48,000
Problem 10: A 9 that stays
The hundreds digit is 8. The digit to its right is 6, so the 8 becomes 9. The tens and ones become 0.
99,900
Grade 4 Rounding Worksheet Answer Key: problems 11–15
Problem 11: Carry across places
The hundreds digit is 9. The digit to its right is 5, so round up. \(9 + 1 = 10\), so write 0 and carry 1. The carry moves through every 9 to the left: 99,900 plus 100 is 100,000.
100,000
Problem 12: Nearest hundred thousand
The hundred thousands digit is 6. The digit to its right is 4, so the 6 stays. All the digits to the right become zeros.
600,000
Problem 13: Round up into the next ten thousand
The ten thousands digit is 4. The digit to its right is 9, so the 4 becomes 5. The rest become zeros.
850,000
Problem 14: One number, every place
For each place, look at the digit to its right.
Answers: 372,470; 372,500; 372,000; 370,000; 400,000.
Problem 15: Rounds to 60
A number rounds to 60 if it is at least halfway down from 60 to 50, and less than halfway up to 70. The halfway marks are 55 and 65. 55 rounds up to 60, but 65 rounds up to 70.
Smallest: 55. Greatest: 64.
Grade 4 Rounding Worksheet Answer Key: problems 16–20
Problem 16: Rounds to 4,000
The halfway marks are 3,500 and 4,500. 3,500 rounds up to 4,000. 4,500 rounds up to 5,000, so the greatest is 4,499.
Smallest: 3,500. Greatest: 4,499.
Problem 17: Attendance report
The thousands digit is 8. The digit to its right is 7, so round up. 38,742 is past the halfway mark 38,500.
The scoreboard shows about 39,000 fans.
Problem 18: Road trip
Nearest hundred: the hundreds digit is 4 and the digit to its right is 6, so round up to 2,500. Nearest ten: the tens digit is 6 and the digit to its right is 8, so round up to 2,470.
About 2,500 miles to the nearest hundred and 2,470 miles to the nearest ten.
Problem 19: Find the mistake
The digit to the right of the hundreds place is 5. A 5 means round up, but Sofia let the 3 stay. The 3 should become 4.
The correct answer is 4,400.
Problem 20: Pencil sales
1,284 rounded to the nearest ten is 1,280. Rounded to the nearest thousand it is 1,000. Rounded to the nearest hundred it is 1,300, which matches the sign.
The number was rounded to the nearest hundred.
Grade 4 Rounding Worksheet Answer Key: problems 21–22
Problem 21: Same or different
Nearest thousand: 7,450 has 4 hundreds, so it rounds down to 7,000. 7,396 has 3 hundreds, so it also rounds to 7,000. Nearest hundred: 7,450 has a 5 in the tens place, so it rounds up to 7,500. 7,396 has a 9 in the tens place, so it rounds up to 7,400.
To the nearest thousand: 7,000 and 7,000 (same). To the nearest hundred: 7,500 and 7,400 (different).
Problem 22: Mystery number
Rounds to 5,340 to the nearest ten: from 5,335 to 5,344. Rounds to 5,300 to the nearest hundred: from 5,250 to 5,349. Numbers in both lists: 5,335 to 5,344.
Least: 5,335. Greatest: 5,344.
How to use this grade 4 rounding worksheet answer key
Read this grade 4 rounding worksheet answer key after trying each problem yourself, and redo any problem you missed.
See every chapter on the Grade 4 math page.