Time: Mathematics Darjah 4 questions

Section A: objective questions

8 marks

Choose the correct answer.

The train leaves at 6:05 in the evening. State the time in the 24-hour system.

0605 hours
1805 hours
1605 hours
1850 hours

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6:05 p.m.: add 12 to the hour, 6 + 12 = 18. So 1805 hours.

For the teacher: Remembering, low difficulty, standard 4.1.1

Textbook p. 139

State 0040 hours in the 12-hour system.

12:40 a.m.
12:40 p.m.
4:00 a.m.
4:00 p.m.

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Hour 00 is 12 at night, so 0040 hours is 12:40 a.m.

For the teacher: Remembering, low difficulty, standard 4.1.1

Textbook p. 140

Convert 2:48 p.m. to the 24-hour system.

0248 hours
1248 hours
1448 hours
2048 hours

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2 + 12 = 14, so 2:48 p.m. = 1448 hours.

For the teacher: Understanding, low difficulty, standard 4.1.1

Textbook p. 142

Diagram 1 shows the time in the evening. Which is the time in the 24-hour system?

Diagram 1

0735 hours
1725 hours
1925 hours
1935 hours

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The clock shows 7:35. In the evening this is 7:35 p.m. = 19:35, which is 1935 hours.

For the teacher: Understanding, low difficulty, standard 4.1.1

Textbook p. 141

Aini started her work at 0920 hours and finished at 1850 hours. What was the duration of her work?

9 hours 30 minutes
9 hours 70 minutes
10 hours 30 minutes
8 hours 30 minutes

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18 h 50 min − 9 h 20 min = 9 h 30 min.

For the teacher: Applying, low difficulty, standard 4.2.1

Textbook p. 144

4 weeks 3 days = ______ days

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4 × 7 = 28, and 28 + 3 = 31 days.

For the teacher: Applying, low difficulty, standard 4.4.2

Textbook p. 148

Fatimah is 3 years 7 months old. What is her age in months?

37 months
10 months
43 months
73 months

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3 × 12 = 36, and 36 + 7 = 43 months.

For the teacher: Applying, low difficulty, standard 4.4.2

Textbook p. 149

Each school assembly rehearsal takes 2 hours 30 minutes. What is the total time for 5 rehearsals?

10 hours 5 minutes
11 hours 30 minutes
12 hours 5 minutes
12 hours 30 minutes

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5 × 2 hours = 10 hours and 5 × 30 minutes = 150 minutes = 2 hours 30 minutes. 10 + 2 hours 30 minutes = 12 hours 30 minutes.

For the teacher: Applying, medium difficulty, standard 4.5.2

Textbook p. 159

Section B: structured questions

37 marks

Answer all questions. Show your working.

Change the time to the other system.

[1 mark] (a)Write 11:24 a.m. in the 24-hour system.

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1124 hours [1]1

Tick each point you got.

[1 mark] (b)Write 10:30 at night in the 24-hour system.

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2230 hours [1]1

Tick each point you got.

[1 mark] (c)Write 0005 hours in the 12-hour system.

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12:05 a.m. [1]1

Tick each point you got.

[1 mark] (d)Write 1616 hours in the 12-hour system.

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4:16 p.m. [1]1

Tick each point you got.

For the teacher: Remembering, low difficulty, standard 4.1.1

Textbook p. 142

Diagram 2 shows the timeline of a school sports day programme.

Timeline: 0820 start, 0900, 1000, 1100, 1140 end, with jumps of 40 minutes, 1 hour, 1 hour, 40 minutes — Diagram 2

[2 marks] (a)Calculate the duration of the programme.

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40 min + 1 h + 1 h + 40 min [1]1
3 hours 20 minutes [1]1

Tick each point you got.

[1 mark] (b)State the end time in the 12-hour system.

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11:40 a.m. [1]1

Tick each point you got.

For the teacher: Understanding, low difficulty, standard 4.2.1

Textbook p. 143

Convert.

[2 marks] (a)5 days 6 hours = ______ hours

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5 × 24 = 120 [1]1
126 hours [1]1

Tick each point you got.

[1 mark] (b)46 days = ______ weeks ______ days

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6 weeks 4 days [1]1

Tick each point you got.

[1 mark] (c)172 months = ______ years ______ months

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14 years 4 months [1]1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 4.4.2

Textbook p. 147

Father built three chicken coops. Coop A took 3 days 4 hours, coop B took 2 days 9 hours and coop C took 1 day 12 hours. Calculate the total time to build all three coops.

[2 marks] (a)Total time in days and hours.

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6 days 25 hours [1]1
7 days 1 hour [1]1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 4.5.1

Textbook p. 152

A mosque is 10 years 7 months old. A school next to it is 1 year 9 months old. How much older is the mosque than the school?

[2 marks] (a)Calculate the difference in years and months.

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9 years 19 months − 1 year 9 months [1]1
8 years 10 months [1]1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 4.5.1

Textbook p. 156

A camp has 8 sessions. Each session takes 2 weeks 4 days.

[2 marks] (a)Calculate the total time in days.

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2 weeks 4 days = 18 days [1]1
8 × 18 = 144 days [1]1

Tick each point you got.

[1 mark] (b)Convert your answer to weeks and days.

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20 weeks 4 days [1]1

Tick each point you got.

For the teacher: Applying, medium difficulty, standard 4.5.2

Textbook p. 159

A building project of 15 days 6 hours has 3 equal phases.

[2 marks] (a)What is the duration of one phase in days and hours?

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15 days ÷ 3 = 5 days and 6 hours ÷ 3 = 2 hours [1]1
5 days 2 hours [1]1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 4.5.2

Textbook p. 161

A machine fills 40 bottles in about 10 minutes.

[2 marks] (a)Estimate the time to fill 200 bottles.

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200 ÷ 40 = 5 groups [1]1
5 × 10 = about 50 minutes [1]1

Tick each point you got.

[1 mark] (b)Father rides a motorcycle at 60 km per hour. Estimate the time to travel 30 km.

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About 30 minutes (half an hour) [1]1

Tick each point you got.

For the teacher: Understanding, medium difficulty, standard 4.3.1

Textbook p. 145

Zahir takes two flights. Flight 1 leaves at 0750 hours and arrives at 1010 hours. Flight 2 leaves at 1400 hours and arrives at 1845 hours.

[1 mark] (a)How long is flight 1?

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2 hours 20 minutes [1]1

Tick each point you got.

[1 mark] (b)How long is flight 2?

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4 hours 45 minutes [1]1

Tick each point you got.

[1 mark] (c)Was Zahir in the air for more than 7 hours?

YesNo

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Yes

2 h 20 min + 4 h 45 min = 7 h 5 min, which is more than 7 hours.

[2 marks] (d)How long did he wait between the two flights?

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1400 − 1010 [1]1
3 hours 50 minutes [1]1

Tick each point you got.

For the teacher: Analysing, medium difficulty, standard 4.6.1

Textbook p. 164

Father is 38 years 4 months old. Father's age is 4 times Dina's age. Grandfather's age is twice father's age.

[2 marks] (a)How old is Dina, in years and months?

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38 years 4 months = 460 months, 460 ÷ 4 = 115 months [1]1
9 years 7 months [1]1

Tick each point you got.

[1 mark] (b)How old is grandfather?

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76 years 8 months [1]1

Tick each point you got.

For the teacher: Analysing, medium difficulty, standard 4.6.1

Textbook p. 166

Amin says: "1 year 9 months + 3 years 5 months = 4 years 14 months."

[1 mark] (a)Is the answer in its simplest form?

YesNo

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14 months is more than 1 year, so it should be changed.

[2 marks] (b)Explain your answer and write the correct answer.

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14 months = 1 year 2 months, more than 12 months [1]1
5 years 2 months [1]1

Tick each point you got.

For the teacher: Evaluating, high difficulty, standard 4.5.1

Textbook p. 153

A school programme must start at 0800 hours and finish before 1100 hours. It has three items: assembly (25 minutes), performance (1 hour 40 minutes) and prize giving (45 minutes). The items follow each other with no break.

[2 marks] (a)Write the start time and end time of each item in the 24-hour system.

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Assembly 0800 to 0825 [1]1
Performance 0825 to 1005 and prize giving 1005 to 1050 [1]1

Tick each point you got.

[1 mark] (b)Does the programme finish before 1100 hours? Give the finish time.

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Yes, it finishes at 1050 hours [1]1

Tick each point you got.

For the teacher: Creating, high difficulty, standard 4.6.1

Textbook p. 167

Section A: objective questions

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Section B: structured questions

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20