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## Introduction

### Measuring time in ancient time?

Time was once measured using the lengths of shadows formed at different times of the day.

Modern way of measuring time: The modern convention is to divide it into 24 hours, An hour into 60 minutes, and a minute into 60 seconds.

Vocabulary:

• Day
• Hour
• Minute
• Second

### Let’s understand the units of time with some daily basis time.

Today, the usual measuring instruments for time are clocks and watches

#### Hours

1. How much time do you take to read?

1. How much time do you play?

#### Minutes

1.  How much time do you take to drink a glass of milk?

1. How much time does it take to comb hair?

#### Seconds

Very short durations are expressed in seconds which is the smallest time unit.

1. How much time does it take to kick a ball?

### Conversion between the units of time

To convert from one unit of time to another unit, we need to multiply or divide.

Example 1

1. Convert 67 minutes into seconds.

Solution: 67 min = 67 × 60

=  4020 sec

2. Convert 4 ½  hours into minutes

Solution: 4 ½ hr = 4 × 60 + ½ × 60

= 240 + 30

=  270 min

3. Convert 250 minutes into hours and minutes.

Solution: 1 hr = 60 min  or  60 min = 1 hr

250 min = 250/60

= 4 hr 10 min

4. Convert 81 hours into days and hours.

Solution: 1 day = 24 hr  or  1 hr = 1/24 day

= 81 hr

= 81/24 hr

= 3 days  9 hr

Example: – Shelly took 1 hr 27 minutes to cook the food and 240 seconds to get ready for the office. Find the total time she has taken in minutes?

Solution: Shelly took 1 hr 27 minutes + 240 seconds

= 1 × 60 + 27 + 240/60

= 60 + 27 + 4

= 91 min

### Concept Map

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