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Mathematics

Number concept, addition and subtraction

Addition

Educator section

Memorandum

1. 262; 364; 466; 568; 670; 772; 874; 976; 1 078

2.

2.1 2 589; 2 592; 2 596; 2 598; 2 601; 2 604; 2 607

2.2 7 939; 8 039; 8 139; 8 239; 8 339; 8 439; 8 539

2.3 18 213; 28 213; 38 213; 48 213’ 58 213; 68 213; 78 213; 88 213

Leaner Section

Content

Activity: to use a series of techniques to do calculations [lo 1.10]

1. The calculator is a wonderful aid for checking our calculations. If you know how to use the "constant function" of your calculator, an activity like the previous and following ones is child's play! See if you can complete the following arrow diagram with the aid of your calculator.

  • What are you going to key in? ______________________________________

2. Use the constant function of your calculator again and write down the numbers that appear on the screen when you key in the following:

2.1 2 586 + 3 = = = 2 607

__________________________________________________________________________________________________________________________________________

2.2 7 839 + 100 = = = 8 539

__________________________________________________________________________________________________________________________________________

2.3 8 213 + 10 000 = = = 88 213

__________________________________________________________________________________________________________________________________________

You know by now that different peoples used different numerals to write down numbers. Let us take an in-depth look at the Romans' way of writing:

DO YOU STILL REMEMBER?

  • In the previous module we saw that the Roman numerals differed from ours.
Our numbers: 1 2 3 4 5 6 7 8 9 10
Roman numerals: i ii iii iv v vi vii viii ix x

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.

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Source:  OpenStax, Mathematics grade 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10994/1.3
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