Practice on measuring time

### 1.1 Solving textbook exercises on pages 56 and 57

**Lesson 1 Textbook page 156**

Write the correct number in the dot:

a) 1 century = … year b) 1 week has … days

1 year = … month 1 day = … hour

A non-leap year has … days 1 hour = … minutes

1 leap year has … days 1 minute = … seconds

1 month has … (or …) days

February has … or … days

__Solution guide:__

a) 1 century = 100 years b) 1 week has 7 days

1 year = 12 months 1 day = 24 hours

A non-leap year has 365 days 1 hour = 60 minutes

1 leap year has 366 days 1 minute = 60 seconds

1 month has 30 (or 31) days

February has 28 or 29 days

Lesson 2 Textbook page 156

Write the correct number in the dot:

a) 2 years and 6 months = … months

3 minutes 40 seconds = … seconds

1 hour 5 minutes = … minutes

2 days 2 hours = … hours

b) 28 months = … years … months

150 seconds = … minutes … seconds

144 minutes = … hours … minutes

54 hours = … date … time

c) 60 minutes = … hours

45 minutes = … hours = 0,… hours

15 minutes = … hour = 0,… hour

1 hour 30 minutes = … hours

90 minutes = … hours

6 minutes = …hours =…0,…hours

12 minutes = … hours = 0,… hours

3 hours 15 minutes = … hours

2 hours 12 minutes = … hours

d) 60 seconds = … minutes

90 seconds = … minutes

1 minute 30 seconds = … minutes

30 seconds = … minutes = 0,… minutes

2 minutes 45 seconds = …. minutes

1 minute 6 seconds = … minutes

__Solution guide:__

a) 2 years 6 months = 30 months

3 minutes 40 seconds = 220 seconds

1 hour 5 minutes = 65 minutes

2 days 2 hours = 50 hours

b) 28 months = 2 years 4 months

150 seconds = 2 minutes 30 seconds

144 minutes = 2 hours 24 minutes

54 hours = 2 days 6 hours

c) 60 minutes = 1 hour

45 minutes = \(\frac{3}{4}\) hours = 0.75 hours

15 minutes = \(\frac{1}{4}\) hours = 0.25 hours

1 hour 30 minutes = 1.5 hours

90 minutes = 1.5 hours

30 minutes = \(\frac{1}{2}\) hours = 0.5 hours

6 minutes = \(\frac{1}{10}\) hours = 0.1 hours

12 minutes = \(\frac{1}{5}\) hours = 0.2 hours

3 hours 15 minutes = 3.25 hours

2 hours 12 minutes = 2.2 hours

d) 60 seconds = 1 minute

90 seconds = 1.5 minutes

1 minute 30 seconds = 1.5 minutes

30 seconds = 0.5 minutes

2 minutes 45 seconds = 2.75 minutes

1 minute 6 seconds = 1.1 minutes

Lesson 3 Textbook page 157

How many hours and minutes are on the clock?

__Solution guide:__

The clock on the left shows 10 o’clock.

The clock on the right shows 6 hours and 5 minutes.

The clock on the left shows 9:43 minutes (or 10 hours 17 minutes).

The clock on the right shows 1 hour 12 minutes.

Lesson 4 Textbook page 15

Choose a letter that has a right answer:

A car intends to travel a distance of 300 km. The car is traveling at 60km/hr and has traveled \(2\frac{1}{4}\) hours. How many kilometers does the car still have to travel?

The distance left by the car is:

A. 135km B. 165km

C. 150km D. 240km

__Solution guide:__

Convert \(2\frac{1}{4}\) hours = \(\frac{9}{4}\) hours.

The distance traveled by the car in kilometers is:

60 × 94 = 135 (km)

The number of kilometers the car still has to travel is:

300 − 135 = 165(km)

Answer: 165km

Choose answer B.

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