Problem Analysis:
The worksheet is divided into two main sections:
1.
Rounding Numbers to the Nearest Hundred: This involves rounding given numbers to the nearest hundred.
2.
Clock Problems: This involves determining the time after a specified duration has passed.
Let's solve each section step by step.
---
Section 1: Rounding Numbers to the Nearest Hundred
#### Rules for Rounding to the Nearest Hundred:
- Look at the tens digit of the number.
- If the tens digit is 5 or greater, round up to the next hundred.
- If the tens digit is less than 5, round down to the previous hundred.
#### Solutions:
1.
627:
- Tens digit = 2 (less than 5).
- Round down to 600.
-
Answer: 600
2.
489:
- Tens digit = 8 (greater than or equal to 5).
- Round up to 500.
-
Answer: 500
3.
223:
- Tens digit = 2 (less than 5).
- Round down to 200.
-
Answer: 200
4.
880:
- Tens digit = 8 (greater than or equal to 5).
- Round up to 900.
-
Answer: 900
5.
865:
- Tens digit = 6 (greater than or equal to 5).
- Round up to 900.
-
Answer: 900
6.
531:
- Tens digit = 3 (less than 5).
- Round down to 500.
-
Answer: 500
7.
926:
- Tens digit = 2 (less than 5).
- Round down to 900.
-
Answer: 900
8.
675:
- Tens digit = 7 (greater than or equal to 5).
- Round up to 700.
-
Answer: 700
9.
136:
- Tens digit = 3 (less than 5).
- Round down to 100.
-
Answer: 100
10.
786:
- Tens digit = 8 (greater than or equal to 5).
- Round up to 800.
-
Answer: 800
11.
151:
- Tens digit = 5 (equal to 5).
- Round up to 200.
-
Answer: 200
12.
257:
- Tens digit = 5 (equal to 5).
- Round up to 300.
-
Answer: 300
---
Section 2: Clock Problems
#### Problem 13: What time will it be in 4 hours 15 minutes?
-
Initial Time: The clock shows 10:30.
-
Add 4 hours:
- 10:30 + 4 hours = 2:30.
-
Add 15 minutes:
- 2:30 + 15 minutes = 2:45.
-
Answer: 2:45
#### Problem 14: What time will it be in 3 hours 0 minutes?
-
Initial Time: The clock shows 7:45.
-
Add 3 hours:
- 7:45 + 3 hours = 10:45.
-
Add 0 minutes:
- No additional adjustment needed.
-
Answer: 10:45
---
Final Answers:
1. 627 =
600
2. 489 =
500
3. 223 =
200
4. 880 =
900
5. 865 =
900
6. 531 =
500
7. 926 =
900
8. 675 =
700
9. 136 =
100
10. 786 =
800
11. 151 =
200
12. 257 =
300
13. Time after 4 hours 15 minutes:
2:45
14. Time after 3 hours 0 minutes:
10:45
Boxed Final Answer:
\[
\boxed{
\begin{array}{ll}
1. & 600 \\
2. & 500 \\
3. & 200 \\
4. & 900 \\
5. & 900 \\
6. & 500 \\
7. & 900 \\
8. & 700 \\
9. & 100 \\
10. & 800 \\
11. & 200 \\
12. & 300 \\
13. & 2:45 \\
14. & 10:45 \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of rounding worksheets 3rd grade.
