PPT: Racing Seconds | Mathematics (Maths Mela) Class 5 - New NCERT PDF Download

 Page 1


Racing 
Seconds
Page 2


Racing 
Seconds
Measuring Time
We measure time in seconds, minutes, and hours.
Seconds
A second is the smallest unit of time we commonly use.
It is very short, like the time it takes to blink your eyes, snap 
your fingers, or say <go!î
60 seconds = 1 minute.
Page 3


Racing 
Seconds
Measuring Time
We measure time in seconds, minutes, and hours.
Seconds
A second is the smallest unit of time we commonly use.
It is very short, like the time it takes to blink your eyes, snap 
your fingers, or say <go!î
60 seconds = 1 minute.
M i n u t e s
A minute is longer than a second and is used for small tasks.
Examples include tying your shoelaces, sipping a glass of water, or reading a short paragraph in a book.
1 minute = 60 seconds.
H o u r s
An hour is a longer period of time made up of 60 minutes.
It can be used to measure bigger activities like watching a cartoon, playing outside with friends, or finishing 
a short homework assignment.
1  hour = 60 minutes = 3,600 seconds.
Page 4


Racing 
Seconds
Measuring Time
We measure time in seconds, minutes, and hours.
Seconds
A second is the smallest unit of time we commonly use.
It is very short, like the time it takes to blink your eyes, snap 
your fingers, or say <go!î
60 seconds = 1 minute.
M i n u t e s
A minute is longer than a second and is used for small tasks.
Examples include tying your shoelaces, sipping a glass of water, or reading a short paragraph in a book.
1 minute = 60 seconds.
H o u r s
An hour is a longer period of time made up of 60 minutes.
It can be used to measure bigger activities like watching a cartoon, playing outside with friends, or finishing 
a short homework assignment.
1  hour = 60 minutes = 3,600 seconds.
Finding Time Elapsed
Time Elapsed = Ending Time 3 Starting Time
01:15 p.m. to 01:42 p.m.
To find the time elapsed, we 
subtract the starting time from 
the ending time.
01:42 p.m. - 01:15 p.m. = 27 
minutes
03:18 p.m. to 08:18 p.m.
The hours are different but 
minutes are the same.
08:18 p.m. - 03:18 p.m. = 5 
hours
09:15 a.m. to 11:30 a.m.
We need to calculate both 
hours and minutes.
11:30 a.m. - 09:15 a.m. = 2 
hours 15 minutes
Page 5


Racing 
Seconds
Measuring Time
We measure time in seconds, minutes, and hours.
Seconds
A second is the smallest unit of time we commonly use.
It is very short, like the time it takes to blink your eyes, snap 
your fingers, or say <go!î
60 seconds = 1 minute.
M i n u t e s
A minute is longer than a second and is used for small tasks.
Examples include tying your shoelaces, sipping a glass of water, or reading a short paragraph in a book.
1 minute = 60 seconds.
H o u r s
An hour is a longer period of time made up of 60 minutes.
It can be used to measure bigger activities like watching a cartoon, playing outside with friends, or finishing 
a short homework assignment.
1  hour = 60 minutes = 3,600 seconds.
Finding Time Elapsed
Time Elapsed = Ending Time 3 Starting Time
01:15 p.m. to 01:42 p.m.
To find the time elapsed, we 
subtract the starting time from 
the ending time.
01:42 p.m. - 01:15 p.m. = 27 
minutes
03:18 p.m. to 08:18 p.m.
The hours are different but 
minutes are the same.
08:18 p.m. - 03:18 p.m. = 5 
hours
09:15 a.m. to 11:30 a.m.
We need to calculate both 
hours and minutes.
11:30 a.m. - 09:15 a.m. = 2 
hours 15 minutes
12-Hour and 24-Hour Time 
Formats
Time in 24-hour format Time in 12-hour format
05:30 hours 05:30 a.m.
08:35 hours 08:35 a.m.
11:55 hours 11:55 a.m.
14:30 hours 02:30 p.m.
17:30 hours 05:30 p.m.
21:35 hours 09:35 p.m.