# 3.24 To solve problems involving operations and conversion of time

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## Memorandum

1.1 2 h 16 min = 18 h 8 min

2 h 16 min + 15 h 52 min = 17 h 68 min

1.2 15 h - 8 h 27 min = 6 h 33 min

15 h 00 min - 8 h 27 min = 6 h 33 min

1.3 8 h 6 min - 2 h 45 min = 5 h 21 min

8 h 06 min – 2 h 45 min = 5 h 21 min

1.4 12 × 3 h 48 min = 45 h 36 min

12 × 3 h 48 min = 36 h 576 min

1.5 4 h 30 min ÷ 15 min = 18

270 min ÷ 15 min

2.1 16 h 10 min – 10 h 00 min = 6 h 10 min

6 h 10 min – 50 min = 5 h 20 min

a) 1 h 30 min

b) 35 min

c) 6 h 5 min

d) 4 h

## Activity: to solve problems involving operations and conversion of time units [lo 4.2]

We are also going to check whether you still remember how to add and subtract when working with time.

1. Calculate the following:

1.1 2 h 16 min + 15 h 52 min = ___________h___________min

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

1.2 15 h – 8 h 27 min = ___________h___________min

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

1.3 8 h 6 min – 2 h 45 min = ___________h___________min

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

1.4 12 × 3 h 48 min = ___________h___________min

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

1.5 4 h 30 min ÷ 15 min = _________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

2. Write clear number sentences to solve the following problems:

2.1 A cricket match started at 10:00 and stopped at 16:10. How much time was spent on the game if there were two rest periods of 10 minutes each and a lunch period of 30 minutes?

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

2.2 The following is Gerda’s class timetable for Mondays.

a) How much time is spent on English?_________________________________

b) How long are the breaks in total?____________________________________

c) How long is the school day?________________________________________

d) If she has 9 Afrikaans periods per week, how much time is spent in Afrikaans? _____________________________________________________________________

## 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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