Mathematics questions, unit 4

Nama / NameKelas / ClassTarikh / Date

Time

45 marks. Use Practice to check each answer as you go, or Exam to answer everything first.

Section A: objective questions

10 marks

Choose the correct answer.

Question 1

What is the time difference for every GMT step between two neighbouring time zones?

30 minutes
1 hour
2 hours
12 hours

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Each GMT step is 1 hour. For example, GMT +8 is 1 hour behind GMT +9.

For the teacher: Remembering, low difficulty, standard 4.1.1

Textbook p. 142

Question 2

Malaysia is GMT +8. Which statement is correct?

Malaysia is 8 hours behind Greenwich.
Malaysia is 4 hours ahead of Greenwich.
Malaysia has the same time as Greenwich.
Malaysia is 8 hours ahead of Greenwich.

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A plus sign means east of Greenwich, so the time is later: 8 hours ahead.

For the teacher: Remembering, low difficulty, standard 4.1.1

Textbook p. 142

Question 3

Why do countries in the world have different times?

They are in different time zones.
Some countries use faster clocks.
The Moon moves faster over some countries.
Every country chooses its own time at random.

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Places that face the Sun have daytime and places turned away have night, so the world is divided into time zones.

For the teacher: Understanding, low difficulty, standard 4.1.1

Textbook p. 141

Question 4

In Greenwich it is 0212 hours on Tuesday, 8 March. Mexico City is GMT -6. What is the time in Mexico City?

0812 hours, Tuesday
0612 hours, Tuesday
2012 hours, Monday
2012 hours, Tuesday

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Mexico City is 6 hours behind. Add 24 hours to borrow the previous day: 2612 − 6 hours = 2012 hours, and the date goes back to Monday.

For the teacher: Understanding, medium difficulty, standard 4.1.1

Textbook p. 142

Question 5

The time in Kuala Lumpur is 1540 hours. Jakarta is 1 hour behind Kuala Lumpur. What is the time in Jakarta?

1640 hours
1440 hours
1450 hours
1340 hours

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Behind means subtract: 1540 − 1 hour = 1440 hours.

For the teacher: Applying, low difficulty, standard 4.1.2

Textbook p. 146

Question 6

Diagram 1 shows the time in Seremban. The time in Seremban is 1.5 hours ahead of town P. What is the time in town P?

Diagram 1

5:50
8:50
5:20
6:20

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Town P is behind, so subtract 1 hour 30 minutes from 7:20: 7:20 − 1:30 = 5:50.

For the teacher: Applying, low difficulty, standard 4.2.1

Textbook p. 153

Question 7

Wellington shows 1355 hours and Kota Kinabalu shows 0955 hours on the same date. What is the time difference, in minutes?

40 minutes
400 minutes
240 minutes
4 minutes

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1355 − 0955 = 4 hours. 4 × 60 = 240 minutes.

For the teacher: Applying, low difficulty, standard 4.1.2

Textbook p. 147

Question 8

It is 2330 hours on 12 March in Kuala Lumpur. A city is 6 hours ahead of Kuala Lumpur. What is the time and date in that city?

0530 hours, 12 March
1730 hours, 12 March
0530 hours, 11 March
0530 hours, 13 March

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2330 + 6 hours = 2930 hours. 2930 − 2400 = 0530 hours, and the date moves to 13 March.

For the teacher: Applying, medium difficulty, standard 4.2.1

Textbook p. 149

Question 9

The time in Tawau is 7 hours ahead of Dublin. What is the time in Dublin when it is 1:45 p.m. in Tawau?

8:45 p.m.
7:45 a.m.
6:45 a.m.
6:45 p.m.

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1:45 p.m. = 1345 hours. Dublin is behind, so 1345 − 7 hours = 0645 hours = 6:45 a.m.

For the teacher: Applying, medium difficulty, standard 4.1.2

Textbook p. 146

Question 10

Town Y is 3 hours ahead of town X. It is 0215 hours on Tuesday in town Y. What is the time and day in town X?

2315 hours, Monday
0515 hours, Tuesday
2315 hours, Tuesday
0515 hours, Monday

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X is behind, so subtract 3 hours. 0215 − 3 hours goes past midnight: 2315 hours on the previous day, Monday.

For the teacher: Analysing, high difficulty, standard 4.2.1

Textbook p. 149

Section B: structured questions

35 marks

Answer all questions. Show your working.

Question 11

Answer these questions about time zones.

[1 mark] (a)What do the letters GMT stand for?

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Greenwich Mean Time [1]1

Tick each point you got.

[1 mark] (b)A place east of Greenwich has a time that is ______ the time at Greenwich.

Aahead ofBbehind

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ahead of

The Sun reaches eastern places first, so their clocks are ahead.

[1 mark] (c)A place west of Greenwich has a time that is ______ the time at Greenwich.

Aahead ofBbehind

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behind

Western places meet the Sun later, so their clocks are behind.

[1 mark] (d)Name the line from which the world time zones are measured.

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Greenwich Meridian [1] (accept 0° meridian, GMT 0)1

Tick each point you got.

For the teacher: Remembering, low difficulty, standard 4.1.1

Textbook p. 143

Question 12

Diagram 2 shows four places. The time at Greenwich is 0200 hours on the same date.

GMT line with Mexico City at GMT -6, Greenwich 0200, Kuala Lumpur at GMT +8 and Tokyo at GMT +9 — Diagram 2

[1 mark] (a)State the time in Kuala Lumpur.

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0200 + 8 hours = 1000 hours [1]1

Tick each point you got.

[1 mark] (b)State the time in Tokyo.

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0200 + 9 hours = 1100 hours [1]1

Tick each point you got.

[2 marks] (c)Calculate the time difference between Mexico City and Kuala Lumpur.

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8 + 6 [1] (opposite sides, so add)1
14 hours [1]1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 4.1.2

Textbook p. 142

Question 13

At the same moment it is 0905 hours in Kuching and 0635 hours in Mumbai.

[1 mark] (a)Which city is further east?

AKuchingBMumbai

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Kuching

Kuching has the later clock time, so it is ahead and further east.

[2 marks] (b)Calculate the time difference in hours and minutes.

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0905 − 0635 [1]1
2 hours 30 minutes [1]1

Tick each point you got.

[1 mark] (c)State the time difference in minutes.

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2 × 60 + 30 = 150 minutes [1]1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 4.1.2

Textbook p. 145

Question 14

In Penang it is 2250 hours on Saturday. In Darwin it is 0020 hours on Sunday.

[2 marks] (a)Calculate the time difference between the two cities.

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2250 to 2400 is 1 hour 10 minutes, plus 20 minutes [1]1
1 hour 30 minutes [1]1

Tick each point you got.

[1 mark] (b)Which city is ahead?

APenangBDarwin

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Darwin

Darwin is already on Sunday, so its clock is later.

[1 mark] (c)When it is 0930 hours in Penang, what is the time in Darwin?

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0930 + 1 hour 30 minutes = 1100 hours [1]1

Tick each point you got.

For the teacher: Applying, medium difficulty, standard 4.1.2

Textbook p. 145

Question 15

Maheshwaran works in Bern. His family stays in Dungun, Terengganu. The time in Dungun is 7 hours ahead of the time in Bern. He starts a video call at 1135 hours, Bern time.

[1 mark] (a)At what time does the video call start in Dungun?

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1135 + 7 hours = 1835 hours [1]1

Tick each point you got.

[1 mark] (b)The call lasts 25 minutes. At what time does it end in Bern?

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1135 + 25 minutes = 1200 hours [1]1

Tick each point you got.

[2 marks] (c)At what time does it end in Dungun?

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1200 + 7 hours [1] or 1835 + 25 minutes1
1900 hours [1]1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 4.1.2

Textbook p. 153

Question 16

Johari arrives in London at 11:15 p.m. on 10 March (Diagram 3) and texts his mother in Putrajaya. The time in Putrajaya is 7 hours ahead of London.

A two-day time bar for 10 and 11 March with London marked at 2315 hours on 10 March — Diagram 3

[2 marks] (a)State the time and date in Putrajaya.

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2315 + 7 hours = 3015, 3015 − 2400 = 0615 hours [1]1
6:15 a.m. on 11 March [1]1

Tick each point you got.

[1 mark] (b)Bangkok is 1 hour behind Putrajaya. State the time in Bangkok at that moment.

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6:15 a.m. − 1 hour = 5:15 a.m. (0515 hours) [1]1

Tick each point you got.

[1 mark] (c)Johari's father in Bangkok says his watch shows 7:15 a.m. Is he correct?

AYesBNo

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Bangkok is 1 hour behind Putrajaya, so it should be 5:15 a.m., not 7:15 a.m.

For the teacher: Evaluating, medium difficulty, standard 4.2.1

Textbook p. 149

Question 17

A football match is shown live and starts at 2045 hours in Kuala Lumpur. Diagram 4 shows the time of three other cities compared with Kuala Lumpur.

Line from Kuala Lumpur 2045: Naypyidaw 1.5 hours behind, Jakarta 1 hour behind, Osaka 1 hour ahead — Diagram 4

[1 mark] (a)At what time does the match start in Jakarta?

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2045 − 1 hour = 1945 hours [1]1

Tick each point you got.

[1 mark] (b)At what time does the match start in Naypyidaw?

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2045 − 1 hour 30 minutes = 1915 hours [1]1

Tick each point you got.

[2 marks] (c)Calculate the time difference between Naypyidaw and Osaka.

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1.5 hours + 1 hour = 2.5 hours [1] (opposite sides)1
2 hours 30 minutes [1]1

Tick each point you got.

For the teacher: Analysing, high difficulty, standard 4.2.1

Textbook p. 150

Question 18

Hafiz in Kuantan joins an online talk from Cairo at 2100 hours, Malaysia time. The time in Cairo is 6 hours behind Malaysia. The talk lasts 90 minutes.

[1 mark] (a)At what time does the talk start in Cairo?

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2100 − 6 hours = 1500 hours [1]1

Tick each point you got.

[1 mark] (b)At what time does the talk end in Cairo?

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1500 + 1 hour 30 minutes = 1630 hours [1]1

Tick each point you got.

[1 mark] (c)At what time does the talk end in Malaysia?

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2100 + 1 hour 30 minutes = 2230 hours [1]1

Tick each point you got.

[1 mark] (d)State the time difference between Cairo and Malaysia in minutes.

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6 × 60 = 360 minutes [1]1

Tick each point you got.

For the teacher: Applying, medium difficulty, standard 4.2.1

Textbook p. 148

Question 19

Your group makes a world clock display. The clock for Kuala Lumpur is set at 0900 hours. London is 8 hours behind Kuala Lumpur, Riyadh is 5 hours behind and Osaka is 1 hour ahead. Write the time to set on each clock.

[1 mark] (a)London

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0900 − 8 hours = 0100 hours [1]1

Tick each point you got.

[1 mark] (b)Riyadh

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0900 − 5 hours = 0400 hours [1]1

Tick each point you got.

[1 mark] (c)Osaka

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0900 + 1 hour = 1000 hours [1]1

Tick each point you got.

For the teacher: Creating, low difficulty, standard 4.1.2

Textbook p. 152

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