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Shape and Data
Objectives
To use Carroll diagrams to sort.
Resources
Abacus Workbook 1 | Plain paper | 2D shapes | 📄 Sorting shapes on a Carroll diagram
Vocabulary
Carroll diagram | names of 2D shapes | sides | straight | curved | symmetrical
Today's Lesson
Introduction
Ask your student to draw four 4-sided shapes on separate pieces of paper. They should check that they are all different shapes.
Write two labels: ‘squares’; ‘not squares’ and place these on the table. Ask your student to discuss with you which of their shapes are squares, and which are not, and how they know. What makes a square a square?
Your student should then place their shapes under the correct heading on the table.
Explain that they are sorting shapes into a new format today and this is called a Carroll diagram.
Show the 📄 Sorting shapes on a Carroll diagram sheet for an example of this, but don’t ask them to fill this in yet. This type of diagram is named after Lewis Carroll, pen-name of Charles Dodgson, writer, mathematician, logician, Anglican minister, and photographer.
Next, ask them to draw four shapes they like with straight sides on new pieces of paper.
Write two labels: ‘all the sides the same length’ and ‘sides not all the same length’.
Ask your student to place their shapes under the correct headings.
Ask: ‘Where would squares go?'
Now ask: ‘Where would triangles go?’
Repeat, this time sorting shapes into those which are symmetrical and those which are not, those which have one or more ‘square corners’ (right angles) and those which do not.
Main Activity
Ask your student to complete the task on 📄 Sorting shapes on a Carroll diagram.
Workbook
To help your student build upon their learning from today, please ask them to complete the activities on pages 24 and 25 of Abacus Workbook 1.