2.55 To calculate by selecting operations appropriate to solving

Mathematics

Common and decimal fractions

Common fractions

Educator section

Memorandum

INTRODUCTION

The learning programme for grade six consists of five modules:

1. Number concept, Addition and Subtraction

2. Multiplication and Division

3. Fractions and Decimal fractions

4. Measurement and Time

5. Geometry; Data handling and Probability

• It is important that educators complete the modules in the above sequence, as the learners will require the knowledge and skills acquired through a previous module to be able to do the work in any subsequent module.

COMMON AND DECIMAL FRACTIONS (LO 1; 2 AND 5)

LEARNING UNIT 1 FOCUSES ON COMMON FRACTIONS

• This module continues the work dealt with in grade 5. Addition and subtraction of fractions are extended and calculation of a fraction of a particular amount is revised.
• Check whether the learners know the correct terminology and are able to use the correct strategies for doing the above correctly.
• Critical outcome 5 (Communicating effectively by using visual, symbolic and /or language skills in a variety of ways) is addressed.
• It should be possible to work through the module in 3 weeks.
• ** Activity 17 is designed as a portfolio task. It is a very simple task, but learners should do it neatly and accurately. They must be informed in advance of how the educator will be assessing the work.

• LEARNING UNIT 2 FOCUSES ON DECIMAL FRACTIONS
• This module extends the work that was done in grade 5. Learners should be able to do rounding of decimal fractions to the nearest tenth, hundredth and thousandth. Emphasise the use of the correct method (vertical) for addition and subtraction. Also spend sufficient time on the multiplication and division of decimal fractions.
• As learners usually have difficulty with the latter, you could allow 3 to 4 weeks for this section of the work.

** Activity 19 is a task for the portfolio. The assignment is fairly simple, but learners should complete it neatly and accurately. They must be informed in advance of how the educator will be assessing the work.

1.1 374,019

1.2 613,44

1.3 78,721

14 388,76

BRAIN TEASER!

2.4 200 ; 290 ; 3 ; 10,02 ; 2,1 ; 2,5 ; 3,02

3. Numbers whithin the square are equal to double those in the cicle

Leaner section

Content

Activity: to calculate by selecting operations appropriate to solving problems [lo 1.8.8]

1. Now that you know how to add and subtract decimal fractions, you can tackle the following activity. Work on your own. Calculate the following without using your pocket calculator:

1.1 208,96 + 32,459 + 132,6

1.2 458,843 + 56,397 + 98,2

1.3 143,96 – 65,239

1.4 541,23 – 152,47

2. BRAIN-TEASER!

Select any one of the numbers in the circle.

• Add 7,5 to this number.
• Double your answer.
• Subtract 15 from the answer.

Write your answer in the square.

• Do exactly the same with each of the other numbers in the circle.

3. What do you notice when you examine the answers?

Time for self-assessment

Colour the appropriate block:

Assessment

Learning Outcome 1: The learner will be able to recognise, describe and represent numbers and their relationships, and to count, estimate, calculate and check with competence and confidence in solving problems.

Assessment Standard 1.8: We know this when the learner estimates and calculates by selecting and using operations appropriate to solving problems that involve:

1.8.8 addition and subtraction of positive decimals with at least 2 decimal places.