Problem: Rounding Numbers
The task involves rounding numbers to the nearest 10, 100, and 1000. Let's solve each part step by step.
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Part 1: Round these numbers to the nearest 10
-
Rule: To round a number to the nearest 10:
- Look at the digit in the ones place.
- If it is 5 or greater, round up.
- If it is less than 5, round down.
1.
a) 72
- Ones digit: 2 (less than 5)
- Round down:
70
2.
b) 85
- Ones digit: 5 (equal to 5)
- Round up:
90
3.
c) 99
- Ones digit: 9 (greater than 5)
- Round up:
100
4.
d) 44
- Ones digit: 4 (less than 5)
- Round down:
40
5.
e) 36
- Ones digit: 6 (greater than 5)
- Round up:
40
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Part 2: Round these numbers to the nearest 100
-
Rule: To round a number to the nearest 100:
- Look at the digit in the tens place.
- If it is 5 or greater, round up.
- If it is less than 5, round down.
1.
a) 950
- Tens digit: 5 (equal to 5)
- Round up:
1000
2.
b) 125
- Tens digit: 2 (less than 5)
- Round down:
100
3.
c) 610
- Tens digit: 1 (less than 5)
- Round down:
600
4.
d) 849
- Tens digit: 4 (less than 5)
- Round down:
800
5.
e) 462
- Tens digit: 6 (greater than 5)
- Round up:
500
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Part 3: Round these numbers to the nearest 1000
-
Rule: To round a number to the nearest 1000:
- Look at the digit in the hundreds place.
- If it is 5 or greater, round up.
- If it is less than 5, round down.
1.
a) 500
- Hundreds digit: 5 (equal to 5)
- Round up:
1000
2.
b) 9999
- Hundreds digit: 9 (greater than 5)
- Round up:
10000
3.
c) 6227
- Hundreds digit: 2 (less than 5)
- Round down:
6000
4.
d) 1500
- Hundreds digit: 5 (equal to 5)
- Round up:
2000
5.
e) 9931
- Hundreds digit: 9 (greater than 5)
- Round up:
10000
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Final Answers:
1.
Nearest 10:
- a) 70
- b) 90
- c) 100
- d) 40
- e) 40
2.
Nearest 100:
- a) 1000
- b) 100
- c) 600
- d) 800
- e) 500
3.
Nearest 1000:
- a) 1000
- b) 10000
- c) 6000
- d) 2000
- e) 10000
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Boxed Final Answer:
\[
\boxed{
\begin{array}{l}
\text{Part 1:} \\
\text{a) 70, b) 90, c) 100, d) 40, e) 40} \\
\text{Part 2:} \\
\text{a) 1000, b) 100, c) 600, d) 800, e) 500} \\
\text{Part 3:} \\
\text{a) 1000, b) 10000, c) 6000, d) 2000, e) 10000}
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of rounding off worksheet.
