Preparation:

• Prepare the ruler and the plates needed for the lesson (see the heading "Things you need").

Saker du behöver:

1. Plates no: 1, 4, 5, 8, 9, 14

2. Ruler

3. Paper and pencil for calculations

Syfte:

Students will:

1. Develop their knowledge of geometry and area.

2. Practice communicating and collaborating in a group.

3. Practice problem solving by measuring and calculating area.

Introduktion (ca 10 min):

1. Discussion about area:

   • Explain and discuss what an area is and why it is important in a construction context.

   • Ask the students:

     • Why do you think it is important to know the area of things being built?

     • What do you think could happen if a building project turns out to be larger or smaller than planned?

2. Relevance in reality:

   • Give real-life examples, such as how a house must fit into a plot or how floor space affects the furnishings.

Genomförande (ca 20 min):

1. Divide the class:

   • Divide the students into smaller groups and give each group 3 plates.

2. Calculation of area:

   • Ask students to measure each plate with a ruler and calculate the area of each plate in square centimeters.

   • Students should round to the nearest whole number (e.g. if the ruler shows 14.2 cm, they should use 14 cm in their calculations).

3. Work in groups:

   • Students collaborate within their groups to solve the task.

   • Walk around the classroom and provide support and assistance as needed.

Avslutning (ca 10 min):

1. Presentation:

   • Have each group present their results and explain how they calculated the area of their piece.

2. Reflection:

   • Discuss any difficulties and how different groups came up with their solutions.

Curriculum connection:

Speech perception and speech use:

• Reasonableness assessment in estimates and calculations.

Algebra:

• Mathematical equalities and how the equal sign is used to draw simple equations.

Geometry:

• Comparisons and estimates of quantities.

• Measurement of length, mass, volume and time using common modern and older units of measurement.

Problem solving:

• Strategies for solving mathematical problems in student-centered situations.

• Formulation of mathematical questions based on everyday situations.

Results for plates (in cm²):

Piece No. Area (cm²)
1,784
4,338
5,532
8,392
9,299
14,196