Please agree to accept our cookies. If you continue to use the site, we'll assume you're happy to accept them. # 2.16 Multiplicative contexts: area and perimeter 1

Created on 13 August 2019 by ncetm_administrator
Updated on 13 August 2019 by ncetm_administrator

## Introduction

Use addition and multiplication to solve problems about the perimeter of irregular and regular 2D shapes, and to find the area of rectilinear and composite rectilinear shapes; use division to solve associated inverse problems.

## Teaching points

• Teaching point 1: Perimeter is the distance around the edge of a two-dimensional (2D) shape.

• Teaching point 2: Perimeter is measured in units of length and can be calculated by adding together the lengths of the sides of a 2D shape.

• Teaching point 3: Multiplication can be used to calculate the perimeter of a regular polygon; when the perimeter is known, side-lengths can be calculated using division.

• Teaching point 4: Area is the measurement of the surface of a flat item.

• Teaching point 5: Area is measured in square units, such as square centimetres (cm2) and square metres (m2).

• Teaching point 6: The area of a rectangle can be calculated using multiplication; the area of a composite rectilinear shape can be found by splitting the shape into smaller rectangles.   Add to your NCETM favourites Remove from your NCETM favourites Add a note on this item Recommend to a friend Comment on this item Send to printer Request a reminder of this item Cancel a reminder of this item