This worksheet helps students practice calculating elapsed time by subtracting durations from end times to find start times.

To solve the problems related to elapsed time, we need to use subtraction and addition of time. Let's go through each problem step by step.

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Problem 1:

If the presentation ended at 6:15 pm and it took 45 minutes, what time did the presentation start?

#### Solution:
1. The presentation ended at 6:15 pm.
2. It lasted for 45 minutes.
3. To find the start time, subtract 45 minutes from 6:15 pm.

- Start with the minutes:
\( 15 \text{ minutes} - 45 \text{ minutes} \)
Since 15 is less than 45, borrow 1 hour (60 minutes) from 6:00 pm:
\( 15 + 60 = 75 \) minutes.
Now subtract:
\( 75 - 45 = 30 \) minutes.

- Subtract the hour:
Since we borrowed 1 hour, the hour part becomes \( 6 - 1 = 5 \).

- Combine the results:
The start time is 5:30 pm.

#### Answer:
\[
\boxed{5:30 \text{ pm}}
\]

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Problem 2:

The play ended at 8:50 pm. It was 1 hour and 20 minutes long. What time did the play start?

#### Solution:
1. The play ended at 8:50 pm.
2. It lasted for 1 hour and 20 minutes.
3. To find the start time, subtract 1 hour and 20 minutes from 8:50 pm.

- Start with the minutes:
\( 50 \text{ minutes} - 20 \text{ minutes} = 30 \text{ minutes} \).

- Subtract the hours:
\( 8 \text{ hours} - 1 \text{ hour} = 7 \text{ hours} \).

- Combine the results:
The start time is 7:30 pm.

#### Answer:
\[
\boxed{7:30 \text{ pm}}
\]

---

Problem 3:

Dinner was ready at 5:00 pm. It took 52 minutes to cook. What time did dinner go in the oven?

#### Solution:
1. Dinner was ready at 5:00 pm.
2. It took 52 minutes to cook.
3. To find the start time, subtract 52 minutes from 5:00 pm.

- Start with the minutes:
\( 0 \text{ minutes} - 52 \text{ minutes} \)
Since 0 is less than 52, borrow 1 hour (60 minutes) from 5:00 pm:
\( 0 + 60 = 60 \) minutes.
Now subtract:
\( 60 - 52 = 8 \) minutes.

- Subtract the hour:
Since we borrowed 1 hour, the hour part becomes \( 5 - 1 = 4 \).

- Combine the results:
The start time is 4:08 pm.

#### Answer:
\[
\boxed{4:08 \text{ pm}}
\]

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Problem 4:

The movie ended at 2:16 pm. It was 95 minutes long. What time did we start the movie?

#### Solution:
1. The movie ended at 2:16 pm.
2. It lasted for 95 minutes.
3. To find the start time, subtract 95 minutes from 2:16 pm.

- Convert 95 minutes into hours and minutes:
\( 95 \text{ minutes} = 1 \text{ hour and } 35 \text{ minutes} \).

- Start with the minutes:
\( 16 \text{ minutes} - 35 \text{ minutes} \)
Since 16 is less than 35, borrow 1 hour (60 minutes) from 2:00 pm:
\( 16 + 60 = 76 \) minutes.
Now subtract:
\( 76 - 35 = 41 \) minutes.

- Subtract the hours:
Since we borrowed 1 hour, the hour part becomes \( 2 - 1 - 1 = 0 \) (which is 12:00 pm in a 12-hour clock).

- Combine the results:
The start time is 12:41 pm.

#### Answer:
\[
\boxed{12:41 \text{ pm}}
\]

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Problem 5:

We arrived at the mall at 3:10 pm. Since there was so much traffic, it took us 37 minutes to get there. What time did we start driving to the mall?

#### Solution:
1. We arrived at the mall at 3:10 pm.
2. It took 37 minutes to drive there.
3. To find the start time, subtract 37 minutes from 3:10 pm.

- Start with the minutes:
\( 10 \text{ minutes} - 37 \text{ minutes} \)
Since 10 is less than 37, borrow 1 hour (60 minutes) from 3:00 pm:
\( 10 + 60 = 70 \) minutes.
Now subtract:
\( 70 - 37 = 33 \) minutes.

- Subtract the hour:
Since we borrowed 1 hour, the hour part becomes \( 3 - 1 = 2 \).

- Combine the results:
The start time is 2:33 pm.

#### Answer:
\[
\boxed{2:33 \text{ pm}}
\]

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Final Answers:

1. \(\boxed{5:30 \text{ pm}}\)
2. \(\boxed{7:30 \text{ pm}}\)
3. \(\boxed{4:08 \text{ pm}}\)
4. \(\boxed{12:41 \text{ pm}}\)
5. \(\boxed{2:33 \text{ pm}}\)