10. 421
0011 0010 1010 1101 0001 0100 1011
Units of Time
The numbers from 1 to
12 are used to count
the hours.
The small lines
between each number
stand for minutes.
Hours
Minutes
11. 421
0011 0010 1010 1101 0001 0100 1011
There are 60 minutes in
the face of a clock.
The Minute hand
it takes 1 hour to go
round the clock face
once.
12. 421
0011 0010 1010 1101 0001 0100 1011
The minute hand takes 5 minutes to
go from one number to the next.
5
5 x 1 = 5
36. 421
0011 0010 1010 1101 0001 0100 1011
Converting Time
How many seconds are there
in 15 minutes?
15 minutes =
1 minute
60 seconds
15 x 60 seconds = 900 seconds
38. 421
0011 0010 1010 1101 0001 0100 1011
Try This!
How many hour/s are there in 30 minutes?
How many day/s are there in 48 hours?
How many minutes are there in
3 ½ hours?
39. 421
0011 0010 1010 1101 0001 0100 1011
How many hour/s are there in 30
minutes?
30 minutes =
60 minute
1 hour
30 x 1 hour
60
½ hour
40. 421
0011 0010 1010 1101 0001 0100 1011
How many day/s are there in 48 hours?
48 hours =
24 hours
1 day
48 x 1 day
24
2 days
41. 421
0011 0010 1010 1101 0001 0100 1011
3 ½ hours =
1 hour
60 minutes
3 ½ x 60 minutes 210 minutes
How many minutes are there in
3 ½ hours?
42. 421
0011 0010 1010 1101 0001 0100 1011
Addition of Time
I f we are going to add time, we
add the hours by hours and
minutes by minutes.