Transum Maths Software

Enlargements

There are 366 different Starters of The Day, many to choose from. You will find in the left column below some starters on the topic of Enlargements. In the right column below are links to related online activities, videos and teacher resources.

A lesson starter does not have to be on the same topic as the main part of the lesson or the topic of the previous lesson. It is often very useful to revise or explore other concepts by using a starter based on a totally different area of Mathematics.

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Enlargements Starters:

Big Bieber: If the dimensions of an object double, its volume increases by a factor of eight.

Middle of Centres: Find the midpoint of the line joining the centres of enlargement.

Star Wars Day: Estimate the size of an alien given the size of their hand. This could be an introduction to scale factors.

 

Small images of these Starters | | |  Complete Index of Starters

Featured Activity

One Torch Tunnel

One Torch Tunnel

Solve the problem of getting four people through a tunnel with one torch in the minimum amount of time. The solution is not obvious but when you get it you see the elegance and beauty of its cunning.

 

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Notes:

When areas and volumes are enlarged the results are far from intuitive. Doubling the dimensions of a rectangle produces a similar shape with four times the volume! Doubling the dimensions of a cuboid produces a similar shape with eight times the volume!

The activities provided are intended to give pupils experiences of dealing with enlargements so that they better understand the concept and are able to produce diagrams, make models and answer questions on this subject.

Once positive scale factors have been mastered the notion of fractional and negative scale factors await discovery!

Enlargements Activities:

Map Scales: Test your understanding of map scales expressed as ratios with this self marking quiz.

Similar Shapes: Questions about the scale factors of lengths, areas and volumes of similar shapes.

Transformations: Draw transformations online and have them instantly checked. Includes reflections, translations, rotations and enlargements.

Enlargements Videos:

Enlargement by a scale factor: A Maths teacher goes through the idea of enlarging a shape from a centre of enlargement.

Enlargements: How to enlarge a shape by a positive scale factor and a centre of enlargement. Includes a scale factor less than 1 and a centre of enlargement inside the shape.

Negative Enlargement: A video from MathsWatch about Enlargement by a Negative Scale Factor.

Enlargements External Links:

Links to other websites containing resources for Enlargements are provided for those logged into 'Transum Mathematics'. Subscribing also opens up the opportunity for you to add your own links to this panel. You can sign up using one of the buttons below:

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Recently Updated

Circle Equations

Circle Equations

Recognise and use the equation of a circle with centre at the origin and the equation of a tangent to a circle. So far this activity has been accessed 64 times and it is ready for you to enjoy!

 

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