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Mathseeds Lesson sequence

TEACHContent and skills

PRACTISEChildren will:

APPLY

Animated Lesson:Recognise and sort

Recognise that 2D shapes have different numbers of sides and corners and straight or curved sides. Song: It’s Time to Shape Up

identify sides and corners on a triangle. Sort 2D shapes based on the differences in their sides and corners. Sort squares and rectangles.

Worksheet 1Sides and corners

Vocabulary:Shape Sort, Dotty Shapes, Shape Words

Recognise shapes and their words. Reinforce correct formation of shapes.

match shapes to their words. Draw shapes using a set of dots as corners.

Worksheet 2Vocabulary

Find:Shape Monsters, Four in a Row, Sides and Corners, Continue the Pattern

Identify a given shape. Recognise whether a shape is flat (2D) or solid (3D). Count the number of sides and corners on a shape. Recognise a pattern.

choose the given shape. Match the labels 2D and 3D to the correct shapes. Answer the question, How many sides/corners? Choose the next item in the pattern.

Worksheet 3Shape sort

Count:Double Bugs, Smaller or Larger Number

Counting skills:understand how to make a double. Recognise which number is smaller and which is larger.

find the identical group and the double number. Label two numbers smaller and larger.

Worksheet 4 Check

Read:Book

Read aloud book. listen, follow the reading and read along.

Mathseeds book 52: Sides and Corners

Learning objectivesChildren will:• count the number of sides and corners on basic 2D

shapes.• recognise the difference between straight and curved

sides.• match 2D shapes to their names.• identify whether shapes are 2D or 3D.

Australian Curriculum Content DescriptionsNumber and AlgebraPatterns and algebra

ACMNA005 Sort and classify familiar objects and explain the basis for these classifications.

Measurement and GeometryShape

ACMMG022 Recognise and classify familiar two-dimensional shapes and three-dimensional objects using obvious features; focus on geometric features and describing shapes and objects using everyday words such as ‘corners’, ‘edges’ and ‘faces’.

Key vocabularysort, shape, sides, corners, straight, curved, triangle, circle, square, rectangle, numerals 1–20, match, double, same, smaller, larger, flat, 2D, solid, 3D, how many, pattern

Extra assistanceThe difference between two-dimensional shapes and three-dimensional objects can be a tricky concept for

some students. Try some of these ways of explaining the difference.• 2D means it is a flat shape; 3D objects are solid.• You can pick up a 3D object; you can draw a 2D

shape.• 2D shapes can be put together to make 3D objects.• Trace around a 3D object to make 2D shapes.• 2D shapes have sides and corners; 3D objects have

faces, edges and corners.• 2D has length and width; 3D has length, width and

depth.

Classroom activitiesSort Them Out

Put the class in small groups and have a set of flats (2D shapes) and solids (3D objects) for each group. Discuss differences – sides, corners, and faces. Ask students to sort the flats into two or more groups, then explain their classification system. Now ask them to do the same with the solids. Praise all classification systems which can be explained.

Match Up!

Give half the class a triangle, rectangle, square or circle image on a card and the other half has a matching word. Give them a time limit to find a partner and sit together. Then ask them to draw that shape in their book and label it. Shuffle and hand out the cards again until all students have all four shapes in their books.

Lesson 52 • Sorting 2D shapes

1010 Copyright © Mathseeds and Blake eLearning 201510 Copyright © Mathseeds and Blake eLearning 2015

Complete.

Sides and cornersLesson 52 • Worksheet 1Name

Sorting 2D shapes

sides

corners

sides

corners

sides

corners

sides

corners

Number of

1111Copyright © Mathseeds and Blake eLearning 2015 11Copyright © Mathseeds and Blake eLearning 2015

Sides and corners VocabularyLesson 52 • Worksheet 2Name

Sorting 2D shapes

1 Match.

square circle

triangle rectangle

2 Label the parts of the shapes – corner or side.

1212 Copyright © Mathseeds and Blake eLearning 201512 Copyright © Mathseeds and Blake eLearning 2015

1 Join each shape to the correct jar.

2 Colour the shapes. triangle = red square = green rectangle = yellow circle = orange

Shape sort Lesson 52 • Worksheet 3Name

Sorting 2D shapes

6 sides5 sides4 sides3 sides

1313Copyright © Mathseeds and Blake eLearning 2015 13Copyright © Mathseeds and Blake eLearning 2015

1 Draw lines to match.

2 Draw.

Shape sort CheckLesson 52 • Worksheet 4Name

Sorting 2D shapes

a flag with 3 sides a flag with four corners

3 sides

4 sides