TIME

HELLO, WELCOME BACK TO CLASS

 

In previous classes, we would have learnt how to tell time. In this lesson, we will be learning conversion of time.

60 secs = 1 minute

60 mins = 1 hour

24 hours = 1 day

7 days = 1 week

4 weeks = 1 month

12 months = 1 year

52 weeks = 1 year

365 days = 1 year

366 days = 1 leap year

 

Examples:

  1. How many minutes in 6 hours?

1 hour = 60 minutes. So, 6 hours = (6 × 60) minutes. = 360 minutes.

  1. Convert 220 minutes to hours and minutes. 60 minutes = 1 hour

220 minutes = (220/60) hours

M= 3 hours 40 minutes.

Activity

  1. 1. Convert the following:

(i) 7 days 6 hours into hours.

(ii) 6 hours 40 minutes into minutes.

(iii) 4 minutes 25 seconds into seconds.

  1. Convert the following:

(i) 5 years 9 months into months.

(ii) 4 months 10 days into days.

(iii) 7 weeks 6 days into days.

(iv) 1 year into seconds.

  1. Convert the following:

(i) 80 months into years and months.

(ii) 210 weeks into years and weeks.

(iii) 530 days into weeks and days.

Addition and Subtraction of Time

Example 1 :What is 2:45 + 1:10 ?

Solution: Add the Hours: 2+1 = 3

Add the Minutes: 45+10 = 55

The minutes are OK, so the answer is 3:55

 

Example 2: What is 2:45 + 1:20?     Add the Hours: 2+1 = 3    Add the Minutes: 45+20 = 65

The minutes are 60 or more, so

subtract 60 from minutes (65−60 = 5 Minutes)

and add 1 to Hours (3+1 = 4 Hours) so the answer is 4:05

 

Example 3: What is 4:10 – 1:05?

Subtract the Hours: 4−1 = 3

Subtract the Minutes: 10−5 = 5

The minutes are OK, so the answer is 3:05

 

Example 4: What is 4:10 – 1:35? Subtract the Hours: 4−1 = 3

Subtract the Minutes: 10−35 = −25

The minutes are less than 0, so:

add 60 to Minutes (−25+60 = 60−25 = 35 Minutes)

and subtract 1 from Hours (3−1 = 2 Hours)  The answer is 2:35

  

   

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