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  • GETIntPhaseMaths display tagshide tags

    This module is included inLens: Siyavula: Mathematics (Gr. 4-6)
    By: Siyavula

    Review Status: In Review

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To use techniques to do calculations

Module by: Siyavula Uploaders. E-mail the author

MATHEMATICS

Number Concept, Addition and Subtraction

Addition

EDUCATOR SECTION

Memorandum

2. 1.3 1 236

3.1 10 876 + 23 982 M+

43 567 + 21 309 M+

RM = 130 254

3.2 42 861 + 13 579 M+

49 478 + 24 336 M+

RM = 130 254

4. 2 x 17.99 M+

3 x 14.99 M+

2 x 6.98 M+

2 x 16.99 M+

RM = 128.89

Leaner Section

Content

Activity: To use techniques to do calculations [LO 1.10]

DID YOU KNOW?

You can use the memory keys of your pocket calculator to do calculations containing more than one operation, correctly!

1. Look for the following keys on your pocket calculator: M+ ; MR or RCM

2. Look carefully at the example:

(168 + 423) + (256 + 389)

2.1 Press 168 + 423 = M+

2.2 Then press 256 + 389 = M+

2.3 Then press MR or RCM

What is the answer?

TAKE NOTE:

The M+-key makes it possible for the calculator to memorise or store the answer.

The MR (Memory Recall) or RCM (ReCall Memory) key is used when you want to recall all the memorised answers.

3. Use your pocket calculator’s memory to calculate:

3.1 (10 876 + 23 982) + (43 567 + 21 309)

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3.2 (42 861 + 13 579) + (49 478 + 24 336)

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4. Look at the till slip of the Stay Healthy Chemist. Use the memory of your pocket calculator to calculate the total cost of your purchases.

Table 1
     
STAY HEALTHY CHEMIST
       
Tel. 919-2561Fax. 919-2562     3 Short Street Bellville7530
       
  Item Number Price Amount  
       
Vitamin tablets 2 R17,99 ___________
Toothbrush 3 R14,99 ___________
Tissues 2 R 6,98 ___________
Shampoo 2 R16,99 ___________

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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 1.10: We know this when the learner uses a range of techniques to perform written and mental calculations with whole numbers;

1.10.1 adding and subtracting in columns;

1.10.2 building up and breaking down numbers;

1.10.3 rounding off and compensating;

1.10.5 using a calculator.

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Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

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What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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