Rounding Whole Numbers

Show your work for each problem.

1.
Round to the nearest ten.
1. a)30
2. b)20
3. c)35
4. d)40
Answer: 30
The ones digit is , which is less than , so we round down. rounded to the nearest ten is .
2.
Round to the nearest ten.
1. a)80
2. b)90
3. c)70
4. d)75
Answer: 80
The ones digit is , which is 5 or more, so we round up. rounded to the nearest ten is .
3.
Round to the nearest ten.
Answer: 50
The ones digit is , which is less than , so we round down. .
4.
Round to the nearest ten.
Answer: 90
The ones digit is , which is 5 or more, so we round up. .
5.
Round to the nearest ten.
1. a)45
2. b)55
3. c)50
4. d)40
Answer: 50
The ones digit is . Remember: 5 or more means round up! .
6.
Round to the nearest hundred.
Answer: 300
To round to the nearest hundred, look at the tens digit: . Since , round down. .
7.
Round to the nearest hundred.
Answer: 700
To round to the nearest hundred, look at the tens digit: . Since , round up. .
8.
Round to the nearest thousand.
1. a)4,000
2. b)5,000
3. c)4,600
4. d)4,500
Answer: 5,000
To round to thousands, look at the hundreds digit: . Since , round up. .
9.
Round to the nearest hundred.
Answer: 800
1. What digit is in the hundreds place? 7
2. What digit do you look at to decide? 6
3. Is 6 five or more? yes
4. So what is 763 rounded to the nearest hundred? 800
10.
Round to the nearest thousand.
Answer: 3000
1. What digit is in the thousands place? 2
2. What digit do you look at to decide? 8
3. Is 8 five or more, or less than 5? more
4. What is 2,847 rounded to the nearest thousand? 3000
11.
Round to the nearest thousand.
1. a)8,000
2. b)10,000
3. c)9,000
4. d)8,900
Answer: 9,000
The hundreds digit is , which is 5 or more. Round up from 8,000 to 9,000. Note: we don't go to 10,000 because we're rounding 8,950, not 9,500!
12.
Round to the nearest hundred.
Answer: 9500
The hundreds digit is 4. Look at tens digit: 7. Since , round up: .
13.
Estimate by rounding:
Answer: 160
1. Round 47 to the nearest ten 50
2. Round 82 to the nearest ten 80
3. Round 31 to the nearest ten 30
4. Add the rounded numbers: 50 + 80 + 30 160
14.
A school has students. Round this to the nearest hundred.
Answer: 1800
1. What is the hundreds digit in 1,847? 8
2. What digit do you look at to decide? 4
3. Is 4 five or more? no
4. What is 1,847 rounded to the nearest hundred? 1800
15.
A concert had attendees. Round to the nearest thousand.
Answer: 23000
1. What is the thousands digit in 23,456? 3
2. What digit do you look at to decide? 4
3. Is 4 five or more, or less than 5? less
4. What is 23,456 rounded to the nearest thousand? 23000