Activity 4 Work with different kinds of scale Guidelines to implement this activity


Learner’s Book page 12


This activity revises and reinforces the learners’ knowledge of scale from Grade 6. It is very important to make sure the learners have a good understanding of word and line scales before starting this activity. Spend time going over the examples of the scales on pages 11−12 in the Learner's Book.


Background information


Ratio scales are used to describe how much an object has actually been scaled down (or up).


Suggested answers 1.1 1:100 000 (NB There are 100 000 cm in 1 km)


1.2 1:5 500 000 (NB 55 × 100 000)


1.3 1:10 000 (NB 100 cm = 1 m 100 m = 100 × 100 = 10 000)


2.1 Learners will draw a line scale (similar to Example 4 on page 12 of the Learner’s Book) where 1 cm represents 1 km.


2.2 Learners will draw a line scale (similar to Example 4 on page 12 of the Learner’s Book) where 1 cm represents 200 m.


2.3 Learners will draw a line scale (similar to Example 4 on page 12 of the Learner’s Book) where 1 cm represents 2 km (200 000 cm).


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