Time | Mathematics for Grade 4 PDF Download

Introduction

Reading Analogue Clocks

Example: Look at the analogue clock below. Can you tell the time it shows?
4:30

Sol:
The hour hand is pointing at the number 4, which represents the hour. The minute hand is pointing at the 6th mark, which represents 30 minutes. So, the time shown is 4:30.

Now, let's try some more examples:

Sol:
The hour hand is pointing at the number 8, representing the hour. The minute hand is pointing at the 3rd mark, representing 15 minutes. Therefore, the time shown is 8:15.

Q2: Can you tell the time shown on this analogue clock?
10:45

Sol:
The hour hand is pointing at the number 10, representing the hour. The minute hand is pointing at the 9th mark, representing 45 minutes. So, the time shown is 10:45.

Reading Digital Clocks

Example: Look at the digital clock below. What time is displayed?
9:20
Sol: 
The hour displayed is 9, and the minutes displayed are 20. So, the time shown is 9:20.

Let's practice reading some more digital clocks:

Sol:
The hour displayed is 3, and the minutes displayed are 50. Therefore, the time shown is 3:50.

Q2: Can you tell the time displayed on this digital clock?
12:05

Sol:
The hour displayed is 12, and the minutes displayed are 05. So, the time shown is 12:05.

Converting Time

Example: Convert the time shown on the analogue clock to digital format.
6:45

Sol:
The hour hand is pointing at the number 6, and the minute hand is pointing at the 9th mark, representing 45 minutes. Therefore, the time shown in digital format is 6:45.

Let's try converting some more times:

Sol:
The hour hand is pointing at the number 2, and the minute hand is pointing at the 6th mark, representing 30 minutes. So, the time shown in digital format is 2:30.

Q2: Convert the time shown on the analogue clock to digital format.
11:15
Sol:
The hour hand is pointing at the number 11, and the minute hand is pointing at the 3rd mark, representing 15 minutes. Therefore, the time shown in digital format is 11:15.

24-Hour Clock

Example: Convert the time shown on the 24-hour clock to the 12-hour format.
18:45

Sol:
To convert the time to the 12-hour format, we subtract 12 from the hour. 18 - 12 = 6. Therefore, the time shown in the 12-hour format is 6:45 PM.

Now, let's convert some more times from the 24-hour clock to the 12-hour format:

Sol:
To convert the time to the 12-hour format, we subtract 12 from the hour. 14 - 12 = 2. Therefore, the time shown in the 12-hour format is 2:30 PM.

Q2: Convert the time shown on the 24-hour clock to the 12-hour format.
20:15

Sol:
To convert the time to the 12-hour format, we subtract 12 from the hour. 20 - 12 = 8. Therefore, the time shown in the 12-hour format is 8:15 PM.