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# Time - PowerPoint PPT Presentation

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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### Time

By:

Rosarman Abd.Wahid

02B2557

B.Ed. Primary Education

(Mathematics and Science Education)

### 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 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

PROBLEMS ON TIME

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

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.

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.