Your Basket 0 items - £0.00

Students learn how to calculate the area of triangles, parallelograms and trapeziums. They use this knowledge to later find the total surface of cuboids and prisms.

This topic takes place in Term 2 of Year 8 and is the prerequite topic for Circles, Cylinders and Circular Shapes.

- Derive and apply formulae to calculate and solve problems involving: perimeter and area of triangles, parallelograms, trapezia, volume of cuboids (including cubes) and other prisms
- Calculate and solve problems involving: perimeters of 2-D shapes and composite shapes.

- The area of a triangle is the product of its perpendicular height and base divided by two. Students often forget to divide by two.
- To find the area of a composite shapes students should break it down into its individual components.
- When identifying individual components of a composite shape students tend to look for triangles and rectangles rather than trapezia and parallelograms.
- To find the surface of a cube or cuboid students could draw the net and work out the composite area.
- More able students could derive the formula for the surface are of a cuboid.

Develop fluency

- Use language and properties precisely to analyse 2-D and 3-D shapes

Reason mathematically

- Begin to reason deductively in geometry,

Solve problems

- Select appropriate concepts, methods and techniques to apply to unfamiliar and non-routine problems.

Shape

- Derive and apply formulae to calculate and solve problems involving: perimeter and area of triangles, parallelograms, trapezia, volume of cuboids (including cubes) and other prisms
- Calculate and solve problems involving: perimeters of 2-D shapes and composite shapes.

August 4, 2018

When learning how to simplify surds students need to understand the difference between a rational and irrational number. Rational numbers include integers and terminating and repeating decimals. They can be written as a fraction with both the numerator and denominator as integers. An irrational number is a number which, in its decimal form does not […]

July 9, 2018

There are three common methods for sharing an amount to a given ratio. Depending on the age group and ability range I am teaching I would choose one approach over the other two. The three methods are: Using fractions Unitary method Using a table In this blog I will demonstrate each of the three methods […]

July 4, 2018

To introduce plotting scatter graphs and understanding correlation I ask students to think about the relationships between different variables and to describe how they might be related. Here’s my starter activity which students discuss in pairs then present to me on mini-whiteboards. When the students have had time to discuss the matching pairs we talk […]