**Starter:**Stair Perimeter - Use the information implied in the diagram to calculate the perimeter of this shape.

- The Great Dodecahedron This wonderful two dimensional image of a three dimensional solid provides an excellent stimulus for mathematical talk. Pupils are not allowed to use their hands to point but must describe fully any shapes they can see in this picture. This is a good opportunity at the beginning of the lesson to revise the names and properties of basic shapes.
- Area Builder Pupils can now work on their own computers or iPads individually or in pairs. This application is an interactive workspace in which to make shapes using square tiles with given areas and perimeters. It starts with very easy challenges but also contains more difficult puzzles as pupils progress through the levels.
- Area Maze Pupils will need to use their knowledge of rectangle areas to calculate the missing measurement of these geometrical diagrams. A great puzzle linked to the skills required for Secondary school mensuration.
- Composite Shapes Find the areas of combined (composite) shapes made up of one or more simple polygons and circles. This is a classic textbook exercise on area but of course it is self-marking. There are six levels of difficulty and a link to GCSE exam-style questions with worked solutions available to Teacher subscribers.
- Area Two How many different shapes with an area of 2 square units can you make by joining dots on this grid with straight lines? This is an open ended investigation requiring a knowledge of the basic area formulae.

**Finisher:**Voting - If pupils have access to Internet connected devices you could ask them to vote on the validity of some debateable mathematical statements such as 'Zero is a positive number'. Their votes are automatically converted to a bar chart that you can project and then discuss.

Student Voting

It doesn’t happen very often but sometimes you find yourself in the position of having to deliver a lesson at a moment’s notice. In the worst case scenario you do not know what the class have previously been learning and you have been given no information about the nature of the pupils from their normal teacher.

These lesson plans have a *low threshold, high ceiling* so can be great learning opportunities for a wide range of pupils and class dynamics. No preparation is required as all of the activity details can be found by clicking on the links in the plans.

If pupils complete the activities online and earn trophies as a record of their progress teachers (who are Transum subscribers) can see from their class list which pupils have earned which trophies.

Furthermore if pupils do have access to internet connected computers see Laptops In Lessons for more lesson plans. If they have iPads there are some ideas on the iPad Maths page.

Show all Emergency Lesson Plans.

There is a printable page called Lectio Tumultuarios (Latin for Emergency Lesson) designed for Maths tutors (who are Transum subscribers) to have printed and stored in their folder ready to use on the odd occasion when a quick five minute time filler is required.

Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for those learning Mathematics anywhere in the world. Click here to enter your comments.

Transum,

Friday, March 23, 2018

"My extreme emergency lesson (back in the day) was the Four Fours challenge. It was sort of an HCF of all the classes I was likely to have to cover and required no equipment or preparation.

The objective of this challenge is to find the simplest mathematical expression for every integer from one to some maximum (depending on the class), using only common mathematical symbols and four copies of the digit four.

Nowerdays if you want to issue this challenge to a class you could do it using a different digit by using the 4th July Starter page as a projectable visual aid."