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5. Write the time that is shown in the frame:

5.1 Swimming: freestyle relay: 4 x 25m:

1:17,53

5.2 Athletics: 1500m:

5:56,01

Activity 3:

To solve problems involving calculation and conversion between the appropriate units of time [LO 4.2]

1. The annual Athletics meeting was held at school. The girls’ times in the 100 sprint were as follows:

Joy 14,9 seconds

Doreen 15,2 seconds

Petra 14,7 seconds

Kathleen 14,6 seconds

Marie 14,8 seconds

Barbara 15,5 seconds

1.1 Who won the race?

1.2 Explain why you give this answer.

1.3 What was the difference between Kathleen and Barbara’s times?

2. Mother puts a chicken into the oven to roast at 11:50. It takes an hour and ten minutes to roast. When will she take it out of the oven?

Remember: there are 24 hours in a day.

There are 60 minutes in an hour.

There are 60 seconds in a minute.

3. Flight 502 leaves East London at 13:10 and arrives at Johannesburg at 15:30. Flight 504 leaves East London at 19:35 and arrives at Johannesburg at 21:50.

3.1 Did the planes arrive in the morning, afternoon or evening?

Flight 502 ___________ Flight 504___________.

3.2 Which flight was the faster, and how much faster than the other one was it? Write down your calculations clearly, step by step.

. 4. The workers in a car factory start work at 8 a.m. They work until 5 p.m. with a lunch break of one hour and two tea breaks of ten minutes each. For how long do they work each day?

Months of the year – old rhyme:

Thirty days have September, April, June and November;

All the rest have thirty-one,

Excepting February alone, which has twenty-eight days clear,

And twenty-nine in each Leap Year!

5. When we write dates the short way, we write the year, the month and then the day, e.g. 2003: 01: 24 (24 January 2003)

The school year was as follows:

School Term Term Starts Term Ends
1 2003:01:22 2003:03:28
2 2003:04:08 2003:06:27
3 2003:07:22 2003:09:26
4 2003:10:06 2003:12:05

5.1 Write the date of the first day of the second term in full (the long way).

5.2 Write the date of the last day of the fourth term in full (the long way).

5.3 How long was the holiday between the first and second terms? Give your answer in weeks and days.

5.4 How long was the holiday between the second and third terms? Write down statements to show how you calculated this and give your answer in weeks and days.

5.5 How long was the holiday between the third and fourth terms? Give your answer in weeks and days.

6. Hannes is a keen fisherman. He was studying high tides because he was planning to go fishing off the rocks in the June holidays. Study this extract from the Table of High Tides in Cape Town and answer the questions that follow.

Date June July
a.m. p.m. a.m. p.m.
1 0407 1630
2 0443 1707
3 0523 1748
Some dates have been left out here
28 0222 1448
29 0256 1521
30 0331 1555
  • Study the morning high tides. Describe the pattern. Is it always like that?
  • Do the afternoon high tides have a similar pattern? Write yes or no. .

6.3 High tide at Knysna is 43 min. later. When is the morning high tide at Knysna on 30 June?

6.4 How much time goes by between the morning high tide and the afternoon high tide on 28 June?

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Source:  OpenStax, Mathematics grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11101/1.1
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