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iGCSE (2021 Edition)

15.01 Units of time

Worksheet
Units of time
1

Convert the following into 24-hour time:

a

11:33 am

b

11:26 pm

c

12:56 am

d

10:30 am

e

9:15 pm

f

8:40 am

g

7:25 pm

h

10:20 pm

2

Convert the following into 12-hour time:

a

20:59

b

23:10

c

10:44

d

07:12

e

18:45

f

02:00

g

14:24

h

00:30

3

Express the following times in 24-hour time:

a

Quarter to midnight.

b

Twenty past one in the afternoon.

c

Half past ten at night.

d

Quarter past eleven in the morning.

e

Ten past eight in the morning.

f

Ten to four in the afternoon.

4

A clock shows the time 19:39. Describe the time being shown in words.

5

Write the time shown on each of the following clocks in 24-hour time:

a
b
c
d
6

Convert the following to seconds:

a

10 minutes

b

3.5 minutes

c

16 hours

d

9.6 minutes

e

1\dfrac{1}{4} minutes

f

12\dfrac{3}{4} minutes

g

11 minutes

h

24 hours

7

Convert the following to minutes:

a

660 seconds

b

1320 seconds

c

360 seconds

d

600 seconds

e

5 hours

f

8.6 hours

g

11.5 hours

h

12 hours

8

Convert the following to hours:

a

360 minutes

b

600 minutes

c

780 minutes

d

594 minutes

e

36\,000 seconds

f

28\,800 seconds

g

11\,160 seconds

h

25\,920 seconds

9

Complete the following statements:

a

253 seconds is equal to minutes and seconds.

b

285 minutes is equal to hours and minutes.

c

4545 seconds is equal to hour, minutes, and seconds.

10

Convert the following. Assume that there are 30 days in a month and 52 weeks in a year.

a

23 days to hours.

b

11 days to hours.

c

A non-leap year to hours.

d

2 weeks to days.

e

312 hours to days.

f

4 months to days.

g

5 fortnights to days.

h

70 days to weeks.

i

84 days to weeks.

j

3 years to weeks.

k

2 years to fortnights.

l

2 years to months.

11

Find the number of hours in 5 months. Assume that there are 30 days in a month.

Applications
12

A cake needs to cook for one and a half hours. How many minutes is this?

13

Han boils an egg for 360 seconds. How many minutes is this?

14

It takes around 300 minutes to drive from Sydney to Thredbo. How many hours is this?

15

The walk to the letterbox and back takes 1 minute and 48 seconds. How many seconds does the walk take in total?

16

Tamba ran a marathon in 2 hours and 42 minutes. How many minutes was this?

17

Nadia drove for 2 hours and 52 minutes. How many minutes was this?

18

An astronomer observes that a newly discovered planet rotates once every 67 hours, 25 minutes, 3 seconds. How often does the planet rotate in seconds?

19

Carl finished a marathon in 2 hours, 35 minutes and 19 seconds. How many seconds is that?

20

Dave just turned 9 years old. Assuming that there are 365 days in a year and ignoring leap years, find his age in:

a

Days

b

Hours

c

Minutes

d

Seconds

21

If an average person sleeps for 8 hours a night, how many weeks does an average person spend asleep in 65 years? Ignore leap years and round your answer to one decimal place.

22

If an average person showers for 6 minutes per day, how many hours do they spend in a shower in:

a

A non-leap year?

b

55 years (ignoring leap years)?

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Outcomes

0580C1.14

Calculate times in terms of the 24-hour and 12-hour clock. Read clocks, dials and timetables.

0580E1.14

Calculate times in terms of the 24-hour and 12-hour clock. Read clocks, dials and timetables.

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