To solve the problem of finding the unknown start times for each time interval, we need to subtract the elapsed time from the end time. Let's go through each problem step by step.
Problem 1:
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End Time: 4:15 PM
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Elapsed Time: 35 minutes
Solution:
1. Subtract 35 minutes from 4:15 PM.
2. Since 15 minutes - 35 minutes is not possible directly, we borrow 1 hour (60 minutes) from 4:00 PM.
3. 4:15 PM becomes 3:75 PM.
4. 75 minutes - 35 minutes = 40 minutes.
5. Therefore, the start time is
3:40 PM.
Problem 2:
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End Time: 8:40 AM
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Elapsed Time: 22 minutes
Solution:
1. Subtract 22 minutes from 8:40 AM.
2. 40 minutes - 22 minutes = 18 minutes.
3. Therefore, the start time is
8:18 AM.
Problem 3:
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End Time: 12:15 PM
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Elapsed Time: 33 minutes
Solution:
1. Subtract 33 minutes from 12:15 PM.
2. Since 15 minutes - 33 minutes is not possible directly, we borrow 1 hour (60 minutes) from 12:00 PM.
3. 12:15 PM becomes 11:75 PM.
4. 75 minutes - 33 minutes = 42 minutes.
5. Therefore, the start time is
11:42 AM.
Problem 4:
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End Time: 9:00 AM
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Elapsed Time: 50 minutes
Solution:
1. Subtract 50 minutes from 9:00 AM.
2. Since 0 minutes - 50 minutes is not possible directly, we borrow 1 hour (60 minutes) from 9:00 AM.
3. 9:00 AM becomes 8:60 AM.
4. 60 minutes - 50 minutes = 10 minutes.
5. Therefore, the start time is
8:10 AM.
Problem 5:
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End Time: 10:32 PM
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Elapsed Time: 22 minutes
Solution:
1. Subtract 22 minutes from 10:32 PM.
2. 32 minutes - 22 minutes = 10 minutes.
3. Therefore, the start time is
10:10 PM.
Problem 6:
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End Time: 2:20 PM
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Elapsed Time: 12 minutes
Solution:
1. Subtract 12 minutes from 2:20 PM.
2. 20 minutes - 12 minutes = 8 minutes.
3. Therefore, the start time is
2:08 PM.
Problem 7:
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End Time: 6:32 AM
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Elapsed Time: 21 minutes
Solution:
1. Subtract 21 minutes from 6:32 AM.
2. 32 minutes - 21 minutes = 11 minutes.
3. Therefore, the start time is
6:11 AM.
Problem 8:
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End Time: 10:45 PM
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Elapsed Time: 41 minutes
Solution:
1. Subtract 41 minutes from 10:45 PM.
2. Since 45 minutes - 41 minutes = 4 minutes.
3. Therefore, the start time is
10:04 PM.
Final Answers:
1.
3:40 PM
2.
8:18 AM
3.
11:42 AM
4.
8:10 AM
5.
10:10 PM
6.
2:08 PM
7.
6:11 AM
8.
10:04 PM
\boxed{
\begin{array}{ll}
1. & 3:40 \text{ PM} \\
2. & 8:18 \text{ AM} \\
3. & 11:42 \text{ AM} \\
4. & 8:10 \text{ AM} \\
5. & 10:10 \text{ PM} \\
6. & 2:08 \text{ PM} \\
7. & 6:11 \text{ AM} \\
8. & 10:04 \text{ PM} \\
\end{array}
}
Parent Tip: Review the logic above to help your child master the concept of time interval worksheet grade.
