In these lessons, measurement is addressed as it relates to measuring time.

You will learn standard units of time and explore the relationship among the units.

You will learn how to read and record time using a variety of clocks such as digital, analog and 24 hour clocks.

You will learn how to read times on clocks to provide information about relevant situations such as:
• comparing start and finish times to determine how much time has passed
• estimate how long before an event begins, e.g., How long until lunchtime?
• planning events

Related Topics:
More Lessons for Grade 4 Math

Time Worksheets

Time Games

## Telling time to the hour

There are 24 hours in a day; however, time is often described using the 12-hour clock.
On a 12 hour analog clock, the hours go from 1:00 in the morning until 12:00 noon and then it repeats the cycle from 1:00 in the afternoon until midnight.

Have a look at the following timeline to illustrate the use of a.m. and p.m.

## Read and Record Dates and Time

Read and record time on digital and analog clocks.

A clock with numbers and hands ia an analog clock. A clock face shows the numbers from 1 to 12.
There are 24 hours in a day. Each day the hour hand moves twice around the clock. It takes one hour for the hour hand to move from one number to the next.
There are 60 minutes in 1 hour. Each hour, the minute hand moves onces around the clock.
It takes 15 minutes for the minute hand to move 1/4 of the way around the clock.
It takes 30 minutes for the minute hand to move half-way around the clock.
It takes 45 minutes for the minute hand to move 3/4 of the way around the clock.

A clock with numbers and no hands is called a digital clock. It shows the time using numbers and a colon.

Reading and recording time on digital and analog clocks to five minutes.
Reading and recording time to the minute.

How to write dates in metric notation?

## Elapsed Time

Elapsed time is how long an event takes from beginning to end. It can be found only by counting the hours and minutes between the start and the end times
Example:
Fatima and Clara played checkers from 9:20 a.am. to 10:05 a.m. Find the elapsed time in minutes. Count by 5's.
Answer: Fatima and Clara played checkers for 45 minutes.
Example:
They drove to the Tyrell Museum and arrived at 10:08 a.m. After standing in line for 12 minutes, they were ready to go to their first exhibit. What time was it?
Example:
It took them from 11:47 a.m. to 12:10 p.m. to read about the T-Rex. How long did it take to read about T-Rex?

Elapsed Time
Daniel began doing his homework at 4:30 pm. He worked for 1 hour and 35 minutes. How time did he finish?
Elapsed Time using Z Method
This video demonstrates how to find elapsed time using the "Z" Method.
Find the elapsed time from 8:32 am to 11:10 am.

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.