## Time Differences

#### Aligned To Common Core Standard:

**Grade 3 Measurement** - 3.MD.A.1

How to Calculate Time Differences - Calculating time is easy, right? But what to do when you are stuck with calculating time differences? Well, let's make it easy! There are 360 imaginary lines that are running vertically across the poles of the Earth. These lines are known as longitudes or meridians. Each of this longitude is known as a degree. The longitude that passes through Greenwich, near London, is 0 degree and is considered as the standard time zone. The time zones for all other zones are also calculated through the Greenwich time zone accordingly. The difference between each time is almost four minutes. So when it is noon in Greenwich, the time at 1 degree would be 12:04. Just like this, the standard meridian in India is 82 and a half degrees so the time difference between the two longitudes is 82. When you multiply the number by four, you will get 330 minutes, which is 5 hours and 30 minutes. This selection of worksheets and lessons help students learn to measure the amount of time between fixed times.

### Printable Worksheets And Lessons

- How Many Minutes Until... Step-by-Step Lesson- All the questions are relative to 3:30 which is a great way to introduce this skill.
- Time Differences Lesson - We focus on the concept of block time; for example a half-an-hour later.
- How Many Minutes Until... Practice Worksheet - A real gem to help the students get a handle on it all.
- Time Differences Worksheet - The focus is on adding and subtracting half-hours.
- Time of Day Lesson and Practice Worksheet - You see the time, if you were to look outside would it be sunny or dark. I guess that would also depend on you geographic location.
- Time of Day Practice Worksheet - Circle on the scale is a helpful skill to have.

#### Homework Sheets

I go all time zone crazy with you in number 2.

- Homework 1 - These are the times that Daniel needs to eat in the afternoon. How far are the clocks apart?
- Homework 2 - If it is midnight in Seattle, what time is it in Boston?

#### Practice Worksheets

Number 1 took me half a day to write to make it fun.

- Practice 1 - Jimmy is a very busy person. Everyday he works until everything is complete. Look at the time of day that Jimmy starts work and all the tasks that he has for the day. Determine when Jimmy will be done with his day.
- Practice 2 - Find the time differences between the Start and End clocks.
- Practice 3 - First, look at the current time and compare the value to the end time.

#### Math Skill Quizzes

Yes, quiz number two was properly researched, I didn't just throw random numbers up there.

- Quiz 1 - The tow truck driver had a busy week. He wants to calculate the number of hours he worked each day. Help the driver find out how many minutes and hours he worked each day.
- Quiz 2 - Terence is a truck driver that travels the country. Terrence maps out the pickups and drop offs he needs to make this month. Determine the time that Terence will arrive at each destination. Driving time includes breaks.