Mathematics
Measurement and time
Time
Educator section
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
Leaner section
Content
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
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1.2 15 h – 8 h 27 min = ___________h___________min
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1.3 8 h 6 min – 2 h 45 min = ___________h___________min
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1.4 12 × 3 h 48 min = ___________h___________min
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1.5 4 h 30 min ÷ 15 min = _________________________
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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?
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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.