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Time. By: Rosarman Abd.Wahid 02B2557 B.Ed. Primary Education (Mathematics and Science Education). 1 hour = 60 minutes 1 minute = 60 seconds. Example 1: Express 2 h 45 min in minutes . 2 h 45 min = 2 h + 45 min = (1 h + 1 h) + 45 min

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slide1

Time

By:

Rosarman Abd.Wahid

02B2557

B.Ed. Primary Education

(Mathematics and Science Education)

1 hour 60 minutes 1 minute 60 seconds

1 hour = 60 minutes1 minute = 60 seconds

Example 1: Express 2 h 45 min in minutes.

2 h 45 min = 2 h + 45 min

= (1 h + 1 h) + 45 min

= 60 min + 60 min + 45 min

= 165 min

Therefore, 2 h 45 min = 165 min

1 hour 60 minutes 1 minute 60 seconds1
1 hour = 60 minutes1 minute = 60 seconds

Example 2: Express 215 min in hours and minutes.

215 min = 60 min + 60 min + 60 min + 35 min

= 1 h + 1 h + 1 h + 35 min

= 3 h + 35 min

Therefore, 215 min = 3 h 35 min

slide4

PROBLEMS ON TIME

The school starts at 0745 and ends at 1230. How many hours and minutes do the pupils spend in school?

method 1

Since we cannot subtract 45 min from 30 min, we have to take 1 hour from 12 hours.

Method 1
  • By subtraction

Answer: They spend 4 hours and 45 minutes in school.

method 2

45 min

1 hour

1 hour

1 hour

1 hour

Method 2
  • By counting forward

From the above, we have:

(1 h + 1 h + 1 h + 1 h ) + 45 min = 4 h 45 min.

Answer: They spend 5 hours and 15 minutes in school.

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