SILO 2.1 (DRAFT)Year 2, Term 1: Shapes and objectsFocus: Dimensions Scope and sequence: Perimeter, Area, Volume, Capacity, Dimensions |
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Learning
intention: Students
recognise, represent and classify familiar two-dimensional
shapes and three-dimensional objects.
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NSW Syllabus
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Australian Curriculum (version
9.0)
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"A student recognises, describes
and represents shapes including quadrilaterals and other common
polygons." (MA1-2DS-01)
"A student recognises, describes and represents familiar three-dimensional objects." (MA1-3DS-01) |
"Students learn to make, compare
and classify familiar shapes; recognise familiar shapes and
objects in the environment, identifying the similarities and
differences between them." (AC9M1SP01)
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What is the difference between a shape and an object? |
In geometry, shapes are generally considered to be
two-dimensional but objects have three dimensions.
An introductory geometry activity using tangrams is as follows:
Alternatively, you could print the tangrams from this A4 template or provide step-by-step instructions for children to draw their own tangrams using this slideshow.
Using the pieces which you just created, try to make the following shapes:
Shapes and objects are symmetrical if they can be divided into two equal parts along a straight line. Some shapes and objects have multiples lines of symmetry and shapes and objects which are not symmetrical are described as being asymmetrical.The following video (3:14) provides a good overview of symmetry.
Activity: Write out the 26 letters of the alphabet in capitals and also the 10 digits. Identify which characters are symmetrical and draw all lines of symmetry.
How many
characters are not symmetrical? |
Which
characters have the most lines of symmetry? |
Perimeter is the distance around a shape. Area is the
space inside a shape.
Rope activity
A prism is a three-dimensional object where the two ends are the same shape and size. Prisms are also 'polyhedrons' which are solid objects with flat faces. For this reason a cylinder is not classified as prism. Some examples of prisms are shown below:
Introduction activity: Capacity is how much an
object is able to hold. To begin, we will test what shape or
object we can create to have the largest capacity, using only a
piece of paper and tape. Each student will attempt to fold or bend their
paper into an object they think can hold them most in it. When
completed, the object’s capacity will be tested using classroom blocks
to see which can hold the most.
The following formula is not formally introduced until Years 7 and 8 but the teaching points are:
When an object has depth to it, making it able to be filled (such as the cylinder seen in the intro activity), we call this 3 dimensional, or 3D. These objects have different properties: they have a certain number of edges, vertices, and faces that classify them as cubes, prisms, spheres, etc. The diagram below shows where the edges, faces, and vertices of different objects are located. An important note is that edges refer to the area where TWO faces meet, whereas vertices are the locations where THREE OR MORE faces meet.
The following video (6:25) is an introduction to angles.
Problem solving with perimeter and area
Problem solving with volume and capacity
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