# OpenStax-CNX

You are here: Home » Content » Mathematics Grade 6 » To calculate area by investigating and estimating

### Lenses

What is a lens?

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

#### In these lenses

• GETIntPhaseMaths

This module and collection are included inLens: Siyavula: Mathematics (Gr. 4-6)
By: Siyavula

Module Review Status: In Review
Collection Review Status: In Review

Click the "GETIntPhaseMaths" link to see all content selected in this lens.

Click the tag icon to display tags associated with this content.

### Recently Viewed

This feature requires Javascript to be enabled.

### Tags

(What is a tag?)

These tags come from the endorsement, affiliation, and other lenses that include this content.

Inside Collection (Course):

Course by: Siyavula Uploaders. E-mail the author

# To calculate area by investigating and estimating

Module by: Siyavula Uploaders. E-mail the author

## 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

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

## 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.

## Content actions

PDF | EPUB (?)

### What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

#### Collection to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks

#### Module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks