1.1 To be able to solve problems in context

Mathematics

Number concept, addition and subtraction

Subtraction

Educator section

Memorandum

1.1 2 614

1.2 5 860

2-4 Own answer

Leaner section

Content

Activity: to be able to solve problems in context [lo 1.6]

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

• You have probably heard on the news or read in the papers that problems like the one described below are very commonplace nowadays. We have to be able to do calculations correctly if we want to find the answers to these problems!

1. Divide into groups of three. See whether you can solve the following problems. Your educator will supply you with the necessary paper to work on.

1.1 After terrible floods in their town, the Sunshine Primary School decides to contribute as many blankets as possible to flood victims. The Principal, Mrs Kuhn, says that about 10 000 blankets are needed. If the learners collect 7 386 blankets, how many more are needed?

1.2 Two factories produce sweets for disadvantaged children. If the Lollipop factory packaged 15 125 sweets and the Jelly Baby factory 20 985, how many fewer sweets did the Lollipop factory have to distribute?

2. Explain to the rest of the class how your group calculated your answers.

3. Compare your methods. How do they differ?

4. Use a calculator to check the answers.

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 1.6: We know this when the learner solves problems in context including contexts that may be used to build awareness of other Learning Areas, as well as human rights, social, economic and environmental issues such as:

1.6.1 financial (including buying and selling, profit and loss, and simple budgets);

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.