Practice calculating elapsed time using analog and digital clocks in this educational worksheet.

To solve the problem, we need to calculate the elapsed time between the "START" and "STOP" times for each clock or digital display. Let's go through each one step by step.

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1. Analog Clocks (Questions 1-4)

#### Question 1:
- START: The clock shows 8:15.
- STOP: The clock shows 9:00.
- Elapsed Time:
From 8:15 to 9:00 is 45 minutes.
Answer: 45 minutes

#### Question 2:
- START: The clock shows 7:30.
- STOP: The clock shows 8:15.
- Elapsed Time:
From 7:30 to 8:15 is 45 minutes.
Answer: 45 minutes

#### Question 3:
- START: The clock shows 6:45.
- STOP: The clock shows 7:30.
- Elapsed Time:
From 6:45 to 7:30 is 45 minutes.
Answer: 45 minutes

#### Question 4:
- START: The clock shows 9:00.
- STOP: The clock shows 9:45.
- Elapsed Time:
From 9:00 to 9:45 is 45 minutes.
Answer: 45 minutes

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2. Digital Clocks (Questions 5-8)

#### Question 5:
- START: The digital clock shows 3:30.
- STOP: The digital clock shows 7:30.
- Elapsed Time:
From 3:30 to 7:30 is 4 hours.
Answer: 4 hours

#### Question 6:
- START: The digital clock shows 5:18.
- STOP: The digital clock shows 6:18.
- Elapsed Time:
From 5:18 to 6:18 is 1 hour.
Answer: 1 hour

#### Question 7:
- START: The digital clock shows 2:29.
- STOP: The digital clock shows 2:59.
- Elapsed Time:
From 2:29 to 2:59 is 30 minutes.
Answer: 30 minutes

#### Question 8:
- START: The digital clock shows 6:36.
- STOP: The digital clock shows 9:36.
- Elapsed Time:
From 6:36 to 9:36 is 3 hours.
Answer: 3 hours

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Final Answers:

1. 45 minutes
2. 45 minutes
3. 45 minutes
4. 45 minutes
5. 4 hours
6. 1 hour
7. 30 minutes
8. 3 hours

Boxed Final Answer:
\[
\boxed{45 \text{ minutes}, 45 \text{ minutes}, 45 \text{ minutes}, 45 \text{ minutes}, 4 \text{ hours}, 1 \text{ hour}, 30 \text{ minutes}, 3 \text{ hours}}
\]