# YEAR 4 MATHS FOCUS

## MEASUREMENT AND GEOMETRY

Area

Learning Experiences

Area

## AREA

OUTCOME

A student:

MA2-10MG: measures, records, compares and estimates areas using square centimetres and square metres

TEACHING POINTS | Area relates to the measurement of two-dimensional space in the same way that volume and capacity relate to the measurement of three-dimensional space. Students should appreciate that measuring area with a square-centimetre grid overlay is more difficult when the shape to be measured is not rectangular (including not square). This leads to an appreciation of the usefulness of the various algebraic formulas for calculating areas that are developed in later stages. |

LANGUAGE | Students should be able to communicate using the following language: area, irregular area, measure, grid, row, column, parts of (units), square centimetre, square metre, estimate. |

The abbreviation m^2 is read as ‘square metre(s)’ and not ‘metre(s) squared’ or ‘metre(s) square’. Similarly, the abbreviation cm^2 is read as ‘square centimetre(s)’ and not ‘centimetre(s) squared’ or ‘centimetre(s) square’. |

## EXPECTATIONS OF ATTAINMENT

Compare the areas of regular and irregular shapes by informal means (ACMMG087) | measure the areas of common two-dimensional shapes using a square-centimetre grid overlay, eg measure the area of a regular hexagon |

– compare how different placements of a grid overlay make measuring area easier or harder, e.g. | |

– develop strategies for counting partial units in the total area of the shape, eg determine two or more partial units that combine to form one whole unit (Communicating, Problem Solving, Critical and creative thinking) | |

measure the areas of irregular shapes using a square-centimetre grid overlay, e.g. | |

compare two or more areas by informal means, eg using tiles or a square-centimetre grid overlay | |

– explain why two students may obtain different measurements of the area of the same irregular shape (Communicating, Reasoning, Critical and creative thinking) |

Compare objects using familiar metric units of area (ACMMG290) | estimate the larger of two or more rectangular areas (including the areas of squares) in square centimetres and then measure in square centimetres to compare the areas |

estimate the larger of two or more rectangular areas (including the areas of squares) in square metres and then measure in square metres to compare the areas |

Learning Experiences

To be added