# 3.25 To solve problems involving time units

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## Memorandum

1. 4 h 40 min + 24 h + 16 h 30 = 49 h 10 min

2. 45 min × 7 = 315 min = 5 h 15 min

3. 08:05

4. 81 + 365 + 366 + 365 + 365 + 365 + 360 + 52 + 2 325 days

5. 35 km in 20 min

× = 3 × 35 = 105 km/h

6. 2 × 110 km = 275 km

7.1 50 min

7.2 190 min = 3 h 10 min

7.3 Yes

7.4 10:00 and 13:15

7.5 18h00

## Activity: to solve problems involving time units [lo 4.2]

Work with a partner. Read each problem carefully and then solve it as neatly and accurately as possible.

1. Johan leaves on an excursion at 15:20 on Friday. He arrives back at home at 16:30 on Sunday. How long was he gone?

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2. Heleen practises on her violin for 45 min every day. For how many hours and minutes does she practise every week?

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3. An aeroplane departs for London at 19:40 and lands at Heathrow airport 12 h 25 min later. At what time does the plane land?

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4. If Marius was born on 11 October 1962 and John on 21 February 1969, how much older is Marius than John?

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5. If it takes me 20 min to cover 35 km at a constant speed, what is my speed? (km/h)

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6. Mr Voges travels at a constant speed of 110 km/h. How far will he drive in 2 h?

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7. Study the TV programme timetable for SABC3:

7.1 How much time in total is devoted to the news? ________________________

7.2 How much time is devoted to international business news?________________

7.3 Are there any educational programmes? ______________________________

7.4 At what times?___________________________________________________

7.4 For how long does SABC3 broadcast every day?________________________

ASSESSMENT BY EDUCATOR:

Circle the applicable code:

 NUMBER CORRECT CODE 12 - 34 - 56 - 7 1234

## Assessment

Learning Outcome 4: The learner will be able to use appropriate measuring units, instruments and formulae in a variety of contexts.

Assessment Standard 4.2: We know this when the solves problems involving calculations between appropriate time units, including time zones and differences.

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