Time zones worksheet for learning how to tell time and understand global time differences.

Problem Analysis and Solution

The worksheet focuses on understanding time zones and converting times between different cities. Let's break down each part of the problem and solve it step by step.

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#### Part 1: Look at the clocks and choose the correct option.

This section involves identifying the time shown on each clock. The reference clock face is provided to help interpret the times.

1. Clock 1: The hour hand is just past 7, and the minute hand is on 12. This indicates 7:00.
2. Clock 2: The hour hand is just past 9, and the minute hand is on 12. This indicates 9:00.
3. Clock 3: The hour hand is just past 4, and the minute hand is on 12. This indicates 4:00.
4. Clock 4: The hour hand is just past 10, and the minute hand is on 12. This indicates 10:00.

So, the times are:
- Clock 1: 7:00
- Clock 2: 9:00
- Clock 3: 4:00
- Clock 4: 10:00

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#### Part 2: How many hours ahead of San Francisco are the following cities?

This section requires determining the time difference between San Francisco and other cities based on the given clock times. We are told that San Francisco is in the Pacific Time Zone (PST).

##### Step 1: Identify the time in San Francisco
- The time in San Francisco is given as 4:00 AM.

##### Step 2: Determine the time in each city and calculate the time difference
We need to compare the times shown for each city with the time in San Francisco (4:00 AM).

1. Mexico City (Mexico)
- Time shown: 5:00 AM
- Difference: \( 5:00 \text{ AM} - 4:00 \text{ AM} = 1 \text{ hour} \)
- Mexico City is 1 hour ahead of San Francisco.

2. New York (USA)
- Time shown: 6:00 AM
- Difference: \( 6:00 \text{ AM} - 4:00 \text{ AM} = 2 \text{ hours} \)
- New York is 2 hours ahead of San Francisco.

3. Rio de Janeiro (Brazil)
- Time shown: 7:00 PM
- Since Rio de Janeiro is in the afternoon/early evening, we need to account for the 12-hour cycle.
- Convert 7:00 PM to a 24-hour format: \( 7:00 \text{ PM} = 19:00 \)
- Difference: \( 19:00 - 4:00 = 15 \text{ hours} \)
- Rio de Janeiro is 15 hours ahead of San Francisco.

4. Madrid (Spain)
- Time shown: 8:00 PM
- Convert 8:00 PM to a 24-hour format: \( 8:00 \text{ PM} = 20:00 \)
- Difference: \( 20:00 - 4:00 = 16 \text{ hours} \)
- Madrid is 16 hours ahead of San Francisco.

5. Istanbul (Turkey)
- Time shown: 9:00 PM
- Convert 9:00 PM to a 24-hour format: \( 9:00 \text{ PM} = 21:00 \)
- Difference: \( 21:00 - 4:00 = 17 \text{ hours} \)
- Istanbul is 17 hours ahead of San Francisco.

6. Bangkok (Thailand)
- Time shown: 10:00 PM
- Convert 10:00 PM to a 24-hour format: \( 10:00 \text{ PM} = 22:00 \)
- Difference: \( 22:00 - 4:00 = 18 \text{ hours} \)
- Bangkok is 18 hours ahead of San Francisco.

##### Completed Table
| City | Country | Time | Number of hours ahead of San Francisco |
|------------------|---------|------------|----------------------------------------|
| San Francisco | USA | 4:00 AM | |
| Mexico City | Mexico | 5:00 AM | 1 + 0 |
| New York | USA | 6:00 AM | 2 + 0 |
| Rio de Janeiro | Brazil | 7:00 PM | 15 + 0 |
| Madrid | Spain | 8:00 PM | 16 + 0 |
| Istanbul | Turkey | 9:00 PM | 17 + 0 |
| Bangkok | Thailand| 10:00 PM | 18 + 0 |

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#### Part 3: Write the times and add "in the morning," "in the afternoon," or "in the evening."

This section requires writing the times for Madrid, Bangkok, and Rio de Janeiro in a sentence format, including the appropriate time of day.

1. Madrid (Spain)
- Time: 8:00 PM
- Sentence: It's eight o'clock in the evening in Madrid.

2. Bangkok (Thailand)
- Time: 10:00 PM
- Sentence: It's ten o'clock in the evening in Bangkok.

3. Rio de Janeiro (Brazil)
- Time: 7:00 PM
- Sentence: It's seven o'clock in the evening in Rio de Janeiro.

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Final Answer

\[
\boxed{
\begin{array}{l}
\text{Clock Times:} \\
\text{1. 7:00, 2. 9:00, 3. 4:00, 4. 10:00} \\
\text{Time Differences:} \\
\text{Mexico City: 1 hour, New York: 2 hours, Rio de Janeiro: 15 hours, Madrid: 16 hours, Istanbul: 17 hours, Bangkok: 18 hours} \\
\text{Sentences:} \\
\text{It's eight o'clock in the evening in Madrid.} \\
\text{It's ten o'clock in the evening in Bangkok.} \\
\text{It's seven o'clock in the evening in Rio de Janeiro.}
\end{array}
}
\]