Multiplicative contexts: area and perimeter 1
Spine 2: Multiplication and Division – Topic 2.16
Primary
KS2
Year 4
Mastery PD Materials
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.