Topics
7. Time
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Australia
Year 4

7.03 AM and PM

Lesson
Practice
Lesson

Are you ready?

When we use the words morning and afternoon, you are able to picture what part of the day it is. What other words help you to determine a specific part of the day? Make a list and compare it with your friends.

Use of AM and PM

This video looks at how a 12 hr clock can be used to tell time across a day that has 24 hrs, by using AM and PM.

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Examples

Example 1

Choose whether these activities normally happen in the AM or PM.

a

Going to bed.

Worked Solution
Create a strategy

Think about if this happens before or after midday.

Apply the idea

We normally go to bed after midday.

After midday means PM, so the answer is PM.

b

Eating breakfast.

Worked Solution
Apply the idea

We normally eat breakfast before midday.

Before midday means AM, so the answer is AM.

c

Watching the sun rise.

Worked Solution
Apply the idea

The sun rises before midday.

Before midday means AM, so the answer is AM.

Example 2

James went to a movie at 11\text{:}50 am. The movie went for 1 hour and 10 minutes.

a

Would the movie finish in the AM or PM?

Worked Solution
Create a strategy

The movie starts 10 minutes before midday, then goes for an hour and 10 minutes after that.

Apply the idea

After 1 hour and 10 minutes the time will be after midday, so the movie finish in the PM.

b

Complete the statement:

The movie finishes at ⬚\text{:}⬚⬚ pm.

Worked Solution
Create a strategy

Add the 10 minutes first, and then add the 1 hour.

Apply the idea
\displaystyle \text{Time}\displaystyle =\displaystyle 11\text{:}50\text{ am} + 10 \text{ min}+ 1\text{ hour}
\displaystyle =\displaystyle 12\text{:}00\text{ pm}+ 1\text{ hour}Add 10 minutes
\displaystyle =\displaystyle 1\text{:}00\text{ pm}Add 1 hour

The movie finishes at 1\text{:}00 pm.

Idea summary

AM means "before midday" and PM means "after midday."

Outcomes

ACMMG085

Convert between units of time

ACMMG086

Use ‘am’ and ‘pm’ notation and solve simple time problems

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