Introduction
Task
Please complete this exercise in Class –
Exercise 1 - Distance and Length:
Question 1:
Lily sews dresses for little girls.
The material costs R 89,50 per metre and she needs 2 metres of material to make a dress for a 5-year-old; 2,5 metres to make a dress for a 9-year-old and 3 metres to make a dress for 12-year-old. The embroidery cotton costs R 12,55 for a roll of 3 metres.
She uses 2 rolls of cotton per dress.
- How much material will she need to make the following four dresses: 1 dress for a 9-year-old, 2 dresses for 5-year-olds, 1 for a 12-year-old?
- What will the material cost for the four dresses?
- What is the length of embroidery cotton that Lily is going to use when sewing one dress, in metres and centimetres?
- What is the total amount that she going to pay for the embroidery cotton?
- What is the total cost of a dress for a 12-year-old?
Process
After watching the video, and going through the notes on distance and length please use what you have learnt to complete the exercise above.
Evaluation
Please see the Marking Guide below to help assist with the Exercise 1 Above:
| Question: | Marks: |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| Total Marks: | 15 |
Conclusion
After completing Exercise 1 please complete this Homework Activity –
Homework activity 1 – Distance and Length:
Question 1:
Mr. Mark has just finished building a new house. He measured the distance around his yard and found it to be 90 m.
- Fencing material is sold at R95,20 per metre. How much is the fencing material going to cost him?
- Suppose he has to put a pole after every 1,5 m. How many poles will he have to buy?
- If the fencing poles cost R65 each, calculate the total costs of the poles alone.
- Calculate the total cost of fencing the yard.
Question 2:
Jennifer has started a decorating business and has a contract to provide decor at a wedding reception.
- The tables used at this wedding are rectangular with a length of 3m and a width of 1m. The fabric she plans to use for the tablecloth costs R75 per metre (but can be bought in lengths smaller than a metre) and is sold in rolls that are 1,4 m wide. The bride and groom want the tablecloths to hang at least 20cm over the edges of the tables. Calculate the cost of the cloth for each table.
. 
- If there are 15 tables at the wedding, calculate how much she is going to spend on tablecloths alone.
Credits
You may go through these notes as a guide to help with the activities above:
We can estimate some lengths and distances using approximate values for measurements. For example, one metre is approximately the length from your shoulder to your fingertips, if you stand with your arm outstretched. A metre is also approximately the distance of one large step or jump.
Whilst estimating length and distance can be useful, we often need to know exactly how long something is. To measure accurately, we use measuring instruments. Some examples are given in the table below:
A ruler is usually has centimetre and millimetre units on it. They are most commonly 1515 oror 3030 cmcm long. A ruler could be used to measure the length of small tin, or the length of a piece of paper, for example.
A measuring tape has centimetre and metre units marked on it. Measuring tapes are useful for measuring lengths of cloth, or large household objects like furniture and rooms.
The length around the circle (the circumference) of a trundle wheel is 11 mm. When it is rolled across the floor, it makes a 'click' sound for every full rotation of the circle or 11 metre measured. Trundle wheels may be used to measure the length of a classroom, a corridor or a field, for example.
An odometer (pronounced o-dom-e-ter) is a measuring instrument used in cars to measure the distance travelled. The displayed number increases by 11 unit for every kilometre the car travels. In the odometer on the left, this car has driven 100 000 km in total.
|
Length – Conversion factors for length: |
|
10 millimetres (mm) = 1 centimetre (cm) |
|
1 000 millimetres (mm) = 1 metre (m) |
|
100 centimetres (cm) = 1 metre (m) |
|
1 000 metres (m) = 1 kilometre (km) General method: |
• BIG unit down to a SMALLER unit → MULTIPLY by the conversion factor.
• SMALL unit up to a BIGGER unit → DIVIDE by the conversion factor.
Conversion Diagram:
km m cm mm
x 1000 x 100 x 10
We can also reverse it to find lengths in larger units:
km m cm mm
÷ 1000 ÷ 100 ÷ 10
Teacher Page
Ms Kristin Joy De Lilly
For any quires you may have, please feel free to contact me via e-mail:
or Whatsapp:
0737784929