# 3.8 To calculate area by investigating and estimating

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## Memorandum

1.1 13 cm × 13 cm = 169 cm²

1.2 2,2 m × 1,4 m = 3,08 m²

1.3 181 m × 93 m = 16 833 m²

1.4 4,2 m × 2,8 m = 11,76 m²

1.5 243 mm × 178 mm = 43 254 mm²

## Activity: to calculate area by investigating and estimating [lo 4.8.2]

1. Let us see whether you are able to calculate the area of the following (remember to begin your operations with a number sentence and also to take care to include the unit when you write down your final answer):

1.1 the area of a square with a side length of 13 cm

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1.2 the top of a desk of 2,2 m by 1,4 m

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1.3 an elongated rugby field that is 181 m long and 93 m wide

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1.4 how much carpeting you need to cover the floor of a room that is 4,2 m by 2,8 m

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1.5 the cover of a Mathematics book with a length of 243 mm and a width of 178 mm.

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## Assessment

Learning Outcome 4: The learner will be able to use appropriate measuring units, instruments and formulae in a variety of contexts.

Assessment Standard 4.8: We know this when the learner investigates and approximates (alone and/or as a member of a group or team):

4.8.2: area of polygons (using square grids) in order to develop rules for calculating the area of squares and rectangles.

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I think
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