3.2 Decimal fractions in the context of measurement  (Page 3/4)

b) 843 m = 0, _________km

c) 65 litres = 0, __________kℓ

d) 650 litres = 0, __________kℓ

e) 450 mg = _____________g

f) 3 845 g = _________kg

5.5 Make up similar questions to put to the class.

Activity 2:

To solve problems using S.I. units [LO 4.6]

1. The following table shows the rainfall at the Helderberg Nature Reserve in 2003. The records in this table are genuine records that are to be found at a real place.

• Study the table and calculate and fill in the total amounts of rain for each month.

• Check your totals with a friend. Do you agree?

• Can 2,5 ml be fitted into a teaspoon?

• How much liquid does a full teaspoon hold?

• How full is a teaspoon with 2,5 ml of rain in it?

• During which months was there no rain?

• In which rainfall area is this nature reserve: summer rainfall; winter rainfall; all year rainfall? Explain.

• How much rain fell in the Helderberg Nature Reserve during the first six months of 2003?

Write down calculations and answers for the following:

2. At the school Athletics Meeting, in the U/11 Boys Long Jump event, the longest jump of each competitor was recorded as follows:

John 4,4 m

Paul 4,1 m

Garry 4,6 m

Peter 4,0 m

Steve 4,5 m

Tom 3,9 m

David 3,8 m

Colin 3,7 m

Simon 3,5 m

• Who won this event?

• Explain why?

3. A travelling salesman went from Johannesburg to Cape Town, which is approximately 1 442 km; from Cape Town to Windhoek, which is 1 508 km and from Windhoek to Maputo, which is 2409 km and then back to Johannesburg, another 599 km. What was the total distance that he travelled altogether?

4. At the end of a trip the odometer of a car of Easy Hire Car Hire Company shows 3068,4. When the car was hired, it showed 2687,5. What distance did the tourist who hired it travel?

5. In Mother’s shopping bag were:

500 g margarine; 1,2 kg mince; one 450 g tin of jam; 10 g yeast and 5 kg flour. What was the total mass of all the shopping that she had to carry home?

Activity 3:

To investigate and approximate perimeter [LO 4.8.1]

A ssignment:

You may do this in a group under the guidance of your educator. You will need a ball of string, four sticks, measuring tapes and a trundle wheel.

1. Go outside onto a playing field if possible, and peg out a suitable hen-run for your five chickens which your grandfather is going to give you. Discuss the size of the run, its shape and position. Write down the measurements that you decide upon.

Length of run: ________ Width of run: ________________ .

2. Then put a stick in the ground at each corner. Tie the end of the string round one stick and unwind the string along the edge of your hen-run, going round each stick until you get back to where you started. Cut the string and tie it to the stick. Your string marks where you want to put a fence.

3. Measure how much string you used and write it down.

4. Return to your classroom. Draw a diagram of this hen-run on a clean page. Give your diagram a heading and write down the length and the width on your diagram.