In Class 3, you learned to read time using hours and half hours. You also learned about a.m. and p.m. Now in Class 4, we will read time more precisely -- to every 5 minutes!
Think about your school day. The bell rings at 7:45 a.m. and the first period ends at 8:25 a.m. How long was the period? We will learn to find such durations. We will also learn the 24-hour clock used in railways and airports across India.
In Class 3, you learned to read time using hours and half hours. You also learned about a.m. and p.m. Now in Class 4, we will read time more precisely -- to every 5 minutes!
Think about your school day. The bell rings at 7:45 a.m. and the first period ends at 8:25 a.m. How long was the period? We will learn to find such durations. We will also learn the 24-hour clock used in railways and airports across India.
The minute hand moves from one number to the next in 5 minutes. Count by 5s from 12 to read the minutes.
Quarter past = 15 minutes past the hour. Quarter to = 15 minutes before the next hour.
If the hour hand is between 3 and 4, and the minute hand is on 3, the time is 3:15 or quarter past 3.
If the hour hand is near 9 and the minute hand is on 9, the time is 8:45 or quarter to 9.
Duration is the amount of time between a start time and an end time. Count forward from the start time to the end time.
From 2:30 to 5:00 = 2 hours 30 minutes.
From 5:00 to 5:15 = 15 minutes.
Total duration = 2 hours 45 minutes.
From 4:10 to 5:00 = 50 minutes.
1 hour = 60 minutes. To convert hours to minutes, multiply by 60. To convert minutes to hours, divide by 60.
3 x 60 = 180 minutes.
150 / 60 = 2 hours and 30 minutes (since 2 x 60 = 120, and 150 - 120 = 30).
Answer: 2 hours 30 minutes.
In the 24-hour clock, we do not use a.m. or p.m. The hours go from 00:00 (midnight) to 23:59.
For times after 12 noon, add 12 to the hour. For example, 3:00 p.m. = 15:00 hours.
| 12-Hour Clock | 24-Hour Clock |
|---|---|
| 12:00 midnight | 00:00 |
| 6:30 a.m. | 06:30 |
| 12:00 noon | 12:00 |
| 4:15 p.m. | 16:15 |
| 9:45 p.m. | 21:45 |
Remember: 1 year = 12 months = 365 days (366 in a leap year). 1 week = 7 days.
Months with 31 days: January, March, May, July, August, October, December.
Months with 30 days: April, June, September, November. February has 28 or 29 days.
Count from 10th to 25th: 25 - 10 = 15 days.
| Word | Meaning |
|---|---|
| Duration | The amount of time from start to end |
| Quarter Past | 15 minutes after the hour |
| Quarter To | 15 minutes before the next hour |
| 24-Hour Clock | A time system that counts hours from 0 to 23 |
| Calendar | A chart showing days, weeks, and months of a year |
Write the time of each activity in both 12-hour and 24-hour format.
| Activity | 12-Hour Time | 24-Hour Time |
|---|---|---|
| Wake up | ||
| Reach school | ||
| Lunch | ||
| Play time | ||
| Go to bed |
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In Class 3, you learned to read time using hours and half hours. You also learned about a.m. and p.m. Now in Class 4, we will read time more precisely -- to every 5 minutes!
Think about your school day. The bell rings at 7:45 a.m. and the first period ends at 8:25 a.m. How long was the period? We will learn to find such durations. We will also learn the 24-hour clock used in railways and airports across India.
The minute hand moves from one number to the next in 5 minutes. Count by 5s from 12 to read the minutes.
Quarter past = 15 minutes past the hour. Quarter to = 15 minutes before the next hour.
If the hour hand is between 3 and 4, and the minute hand is on 3, the time is 3:15 or quarter past 3.
If the hour hand is near 9 and the minute hand is on 9, the time is 8:45 or quarter to 9.
Think: The minute hand is on 7. How many minutes past the hour is it?
Duration is the amount of time between a start time and an end time. Count forward from the start time to the end time.
From 2:30 to 5:00 = 2 hours 30 minutes.
From 5:00 to 5:15 = 15 minutes.
Total duration = 2 hours 45 minutes.
From 4:10 to 5:00 = 50 minutes.
1 hour = 60 minutes. To convert hours to minutes, multiply by 60. To convert minutes to hours, divide by 60.
3 x 60 = 180 minutes.
150 / 60 = 2 hours and 30 minutes (since 2 x 60 = 120, and 150 - 120 = 30).
Answer: 2 hours 30 minutes.
In the 24-hour clock, we do not use a.m. or p.m. The hours go from 00:00 (midnight) to 23:59.
For times after 12 noon, add 12 to the hour. For example, 3:00 p.m. = 15:00 hours.
| 12-Hour Clock | 24-Hour Clock |
|---|---|
| 12:00 midnight | 00:00 |
| 6:30 a.m. | 06:30 |
| 12:00 noon | 12:00 |
| 4:15 p.m. | 16:15 |
| 9:45 p.m. | 21:45 |
Think: The Rajdhani Express departs at 16:50. What time is that in the 12-hour clock?
| Word | Meaning |
|---|---|
| Duration | The amount of time from start to end |
| Quarter Past | 15 minutes after the hour |
| Quarter To | 15 minutes before the next hour |
| 24-Hour Clock | A time system that counts hours from 0 to 23 |
| Calendar | A chart showing days, weeks, and months of a year |
Remember: 1 year = 12 months = 365 days (366 in a leap year). 1 week = 7 days.
Months with 31 days: January, March, May, July, August, October, December.
Months with 30 days: April, June, September, November. February has 28 or 29 days.
Count from 10th to 25th: 25 - 10 = 15 days.
A. Fill in the Blanks
B. Find the Duration
C. Convert to 24-Hour Clock
D. Multiple Choice Questions
E. Word Problems
Write the time of each activity in both 12-hour and 24-hour format.
| Activity | 12-Hour Time | 24-Hour Time |
|---|---|---|
| Wake up | ||
| Reach school | ||
| Lunch | ||
| Play time | ||
| Go to bed |