3.13 To calculate by selecting appropriate operations for solving

Mathematics

Measurement and time

Area

Educator section

Memorandum

1. 14 856 kg – (235 + 39 kg)

= 5 691 kg

2. (10 000 kg – 9 165 kg) ÷ 39

= 21,41

= 21 bags

Leaner section

Content

Activity: to calculate by selecting appropriate operations for solving particular problems [lo 1.8.2, lo 1.8.4]

To write number sentences to describe a problem situation [lo 2.4]

Do this work on your own. Read through the problems provided below and see whether you are able to find the solutions. Remember to use the number sentences! Also remember to show neat, clear operations and don't forget about the units.

1. A truck transports 235 bags of sand weighing 39 kg each. If the truck with its load weighs 14 856 kg, what is the mass of the truck without its load?

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2. It is a 10 ton truck (may transport a maximum of 10 tons). How many bags can still be loaded without exceeding the mass limit?

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

1.8.2: addition and subtraction of whole numbers;

1.8.4: multiplication of at least whole 4-digit by 3-digit numbers;

Learning Outcome 2: The learner will be able to recognise, describe and represent patterns and relationships, as well as to solve problems using algebraic language and skills.

Assessment Standard 2.4: We know this when the learner writes number sentences to describe a problem situation, including problems within contexts that may be used to build awareness of human rights, social, economic, cultural and environmental issues.