• Recognition of the concept area by direct comparison of shapes.
• Comparison of area size by congruency and decomposition of shapes.
• Comparison of areas using a basic shape.
• Decomposing shapes in order to find areas of composite shapes.

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According to curriculum

Composing new polygons from a basic triangle shape and comparing areas in relation to the area of the basic triangle shape.

3 Origami sheets 15 cm x 15 cm.

• Recognizing the concept of volume.
• Recognizing the use of an accepted unit of volume measurement-a cube.
• Recognizing which measurements are necessary for determining the volume of a prism.
• Recognizing that different structures may have the same volume but different heights.

Structures built with cubes.

The pupils will construct two different sized cubes by a folding process. Using these cubes the pupils will measure the volume of a container and reach the understanding that a number representing a volume measurement must relate to the unit of measurement used. Pupils will learn that different structures assembled with the same number of cubes may have different heights.Height measurement alone is insufficient for volume measurement.

Origami sheets of 2 sizes. 10 x 10 cm,15 x 15 cm.

• Recognizing unit fractions using the area model for parts of a whole.
• Recognizing the form of a unit fraction representing the numerator and  denominator.
• Recognizing  the concept part of a whole.
• Investigating parts of a whole in relation to squares of different area sizes.

In this lesson 1/2 representing a unit fraction as one part of a whole using squares of different area sizes.

Origami sheets of 2 sizes: 10 x 10 cm, 15 x 15 cm.

• Recognizing unit fractions using the area model for parts of a whole.
• Recognizing the form of a unit fraction representing the numerator and  denominator.
• Recognizing  the concept part of a whole.
• Investigating parts of a whole in relation to squares of different area sizes.
• Investigating the part of a whole as a fraction with a numerator different than 1.

Lesson 2/2. Using already folded squares from the previous lesson the pupils will learn about another unit fraction resulting from additional fold to the squares.

Folded squares from the previous lesson. Origami sheets of 2 sizes: 10 x 10 cm, 15 x 15 cm.