1. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Objectives
Day 1
Recognise lines of symmetry, complete symmetrical drawings.
Day 2
Describe, name and sort 2-D shapes.
Day 3
Describe, name and sort 2-D shapes using a Venn diagram.
Before teaching, be aware that:
On Day 1 children will need mini-whiteboards and pens. You will need internet access, paper, selection of large 2-D shapes (most with lines of symmetry, some without), long straight thin strips of paper, mirror.
On Day 2 children will need mini-whiteboards and pens. You will need a selection of 2-D shapes (regular and irregular), a timer, ‘Pentagons, hexagons and octagons’ (see resources).
On Day 3 children will need mini-whiteboards and pens. You will need two hoops, large selection of 2-D shapes, sticky notes
Year 3

2. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Starters
Day 1
Find lines of symmetry (pre-requisite skills)
Day 2
2-D shapes (pre-requisite skills)
Day 3
Telling the time (simmering skills)
Choose starters that suit your class by dragging and dropping the relevant slide or slides below to the start of the teaching for each day.
Year 3

3. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Starter
Find lines of symmetry
Pre-requisite skills – to use this starter, drag this slide to the start of Day 1
Draw a square  with a vertical line of symmetry. We could put a mirror along this line, and it would show the other half of the shape. Draw a square on your whiteboard with a line of symmetry in a different place. Share whiteboards with horizontal and diagonal lines of symmetry.
Show paper squares that have been folded along these lines of symmetry, modelling how one half folds over to sit exactly on top of the other.
Day 2
2-D shapes (pre-requisite skills)
Play ‘Odd one out’. Ask four children to hold up the following shapes: square, equilateral triangle, regular hexagon and a non-square rectangle. Which is the odd one out? Write the name on your whiteboard. Tell me why…
Repeat with other shapes, e.g. semi-circle, rectangle, octagon and pentagon.
Suggested for Day 3
Telling the time (simmering skills)
Use ITP Tell the Time. Set the analogue clock to 1/4 to 4. What is the time? Remind children that it is a quarter of an hour until the next ‘o’clock’ time, which is 4, so it is 1/4 to 4! Point to the digital time 3:45, discussing how this is the same – In 15 minutes it will be 4:00.
Repeat with 1:45. Show time on analogue clock and hide the digital clock. Children work in pairs, one to write the time in words, i.e. ‘quarter to two’ and the other to write the time as it appears on a digital clock, i.e. 1:45. Say the time ‘1/4 to 2’ together; then click to reveal the digital clock to confirm the digital equivalent. Repeat with other 1/4 past and 1/4 to times.
Year 3

4. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Starter
2-D shapes
Pre-requisite skills – to use this starter, drag this slide to the start of Day 2
Play ‘Odd one out’. Ask four children to hold up the following shapes: square, equilateral triangle, regular hexagon and a non-square rectangle. Which is the odd one out? Write the name on your whiteboard. Tell me why…
Repeat with other shapes, e.g. semi-circle, rectangle, octagon and pentagon.
Year 3

5. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Starter
Telling the time
Simmering skills – to use this starter, drag this slide to the start of Day 3
Use ITP Tell the Time. Set the analogue clock to 1/4 to 4. What is the time? Remind children that it is a quarter of an hour until the next ‘o’clock’ time, which is 4, so it is 1/4 to 4! Point to the digital time 3:45, discussing how this is the same – In 15 minutes it will be 4:00.
Repeat with 1:45. Show time on analogue clock and hide the digital clock. Children work in pairs, one to write the time in words, i.e. ‘quarter to two’ and the other to write the time as it appears on a digital clock, i.e. 1:45. Say the time ‘1/4 to 2’ together; then click to reveal the digital clock to confirm the digital equivalent. Repeat with other 1/4 past and 1/4 to times.
Year 3

6. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Objectives
Day 1
Recognise lines of symmetry; complete symmetrical drawings.
Year 3

7. Start by watching this VIDEO CLIP
Day 1: Recognise lines of symmetry; complete symmetrical drawings.
Start by watching this VIDEO CLIP
about symmetry.
Pause the video towards the end and reiterate the questions.
Year 3

8. Day 1: Recognise lines of symmetry, complete symmetrical drawings.
Talk to your partner about these challenges. Write your answers on whiteboards.
Find shapes with 1 line of symmetry.
Which ones have no lines of symmetry?
Find the shapes with 2 or more lines of symmetry.
One of the shapes has
8 lines of symmetry. Which one is it and where are the lines of symmetry?
Provide a range of 2-D shapes for the children to choose from.
Hear children’s answers and discuss any misconceptions.
Year 3

9. Day 1: Recognise lines of symmetry, complete symmetrical drawings.
Lines of symmetry on a 2-D shape divide the shape so it looks exactly the same on either side of the line.
Establish a definition for a ‘line of symmetry’ and write on a poster/ the working wall.
Year 3

10. Day 1: Recognise lines of symmetry, complete symmetrical drawings.
Can you ‘karate chop’ a shape to show the line(s) of symmetry?
Place strips of paper along the object where you would chop it.
Let’s check your ideas with a mirror!
Organise children into a circle. Place some large 2-D shapes in the centre, along with long thin strips of paper.
Choose a child to come and pretend to karate chop a shape to show the line(s) of symmetry.
Year 3

11. Do all of these shapes have a line of symmetry?
Day 1: Recognise lines of symmetry, complete symmetrical drawings.
Do all of these shapes have a line of symmetry?
Repeat with different children to work your way through all of the other shapes.
Children can now go on to do differentiated GROUP ACTIVITIES. You can find Hamilton’s group activities in this unit’s TEACHING AND GROUP ACTIVITIES download.
WT: Fold a picture along a line of symmetry; complete symmetrical pictures.
ARE/GD: Children draw one half of a picture for a partner to complete symmetrically. Begin to explore shapes with two lines of symmetry.
Year 3

12. Year 3 The Practice Sheet on this slide is suitable for most children.
Differentiated PRACTICE WORKSHEETS are available on Hamilton’s website in this unit’s PROCEDURAL FLUENCY box.
WT/ARE/GD: Symmetry Sheet 1
Year 3

13. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Objectives
Day 2
Describe, name and sort 2-D shapes.
Year 3

14. Day 2: Describe, name and sort 2-D shapes.
It has 4 sides.
The sides are all the same length.
It has 4 right angles.
It has 4 lines of symmetry.
It is a polygon because it has all straight sides.
Model how to carefully describe the shape.
What is this shape called?
Year 3

15. Day 2: Describe, name and sort 2-D shapes.
These are all regular shapes.
Regular shapes have sides of the same length and angles the same size.
Year 3

16. Day 2: Describe, name and sort 2-D shapes.
Describe your shape to your partner. Can they guess your shape? You have 30 seconds!
Choose a shape and draw around it on your whiteboard.
Jot down how you would describe your shape.
Children choose one of the shapes on offer to draw around and describe.
Now swap around!
Year 3

17. What mathematical language did we use to describe the shapes…?
Day 2: Describe, name and sort 2-D shapes.
What mathematical language did we use to describe the shapes…?
Write down the key words and display on a poster/ working wall for children to refer back to.
Year 3

18. Let’s have a go at naming each shape…
Day 2: Describe, name and sort 2-D shapes.
Let’s have a go at naming each shape…
These are all polygons, but are irregular shapes as the sides of each are not the same length.
Make a counting error: Oops, I think I counted that side twice…how will we keep track of the number of sides?
Children can now go on to do differentiated GROUP ACTIVITIES. You can find Hamilton’s group activities in this unit’s TEACHING AND GROUP ACTIVITIES download.
WT/ARE/GD: Sort 2-D shapes in a Venn diagram according to children’s criteria.
Year 3

19. The Practice Sheet on this slide is suitable for most children.
Differentiated PRACTICE WORKSHEETS are available on Hamilton’s website in this unit’s PROCEDURAL FLUENCY box.
WT/ARE/GD: Odd one out Sheet 1
Challenge
Year 3

20. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Objectives
Day 3
Describe, name and sort 2-D shapes using a Venn diagram.
Year 3

21. Describe this shape to your partner.
Day 3: Describe, name and sort 2-D shapes using a Venn diagram.
And this one.
Now describe this one.
Describe this shape to your partner.
Take feedback including which are symmetrical and which are not, the number of sides and corners.
Year 3

22. 6 2 Day 3: Describe, name and sort 2-D shapes using a Venn diagram.
Which ones have ‘square corners’?
Remember that these are called right angles.
Count the right angles in each shape.
Year 3

23. hexagon pentagon octagon
Day 3: Describe, name and sort 2-D shapes using a Venn diagram.
hexagon
pentagon
What are they?
octagon
Year 3

24. Day 3: Describe, name and sort 2-D shapes using a Venn diagram.
Have a go at drawing different-looking pentagons.
What should all of your pentagons have in common?
Highlight that all pentagons should be closed shapes with 5 straight sides.
Year 3

25. Day 3: Describe, name and sort 2-D shapes using a Venn diagram.
Now have a go at drawing different-looking hexagons.
How ‘weird’ (irregular) can you make them look?!
Do any of your hexagons have a right angle?
Year 3

26. Day 3: Describe, name and sort 2-D shapes using a Venn diagram.
What about octagons. Can you draw a range of these?
How ‘weird’ (irregular) can you make them look?!
Do any of your octagons have a right angle?
Year 3

27. Day 3: Describe, name and sort 2-D shapes using a Venn diagram.
Chose a 2-D shape and place it on the Venn diagram.
Why did you place it there?
Remind the children about the Venn diagram sorting activity they did on Day 2; then use large (PE) hoops on the floor to create a labelled Venn diagram.
Repeat with other shapes and other children.
Today would be a great day to use a problem-solving investigation – Don’t Make a Triangle – as the group activity, which you can find in this unit’s IN-DEPTH INVESTIGATION box on Hamilton’s website.
Alternatively, children can now go on to do differentiated GROUP ACTIVITIES. You can find Hamilton’s group activities in this unit’s TEACHING AND GROUP ACTIVITIES download.
WT/ARE/GD: Children sort 2-D shapes into a Venn diagram according to two ‘secret’ criteria, with one shape placed as an ‘odd one out’. The rest of the group try to guess the sorting criteria and the odd one out.
Year 3

28. Year 3 The Practice Sheet on this slide is suitable for most children.
Differentiated PRACTICE WORKSHEETS are available on Hamilton’s website in this unit’s PROCEDURAL FLUENCY box.
WT: Sorting 2D shapes Sheet 1
Year 3

29. Year 3 The Practice Sheet on this slide is suitable for most children.
Differentiated PRACTICE WORKSHEETS are available on Hamilton’s website in this unit’s PROCEDURAL FLUENCY box.
ARE/GD: Sorting 2D shapes Sheet 1
Year 3

30. Recognise line symmetry
Shape
Recognise line symmetry
Name/sort 2-D shapes
Well Done! You’ve completed this unit.
Objectives
Day 1
Recognise lines of symmetry, complete symmetrical drawings.
Day 2
Describe, name and sort 2-D shapes.
Day 3
Describe, name and sort 2-D shapes using a Venn diagram.
You can now use the Mastery: Reasoning and Problem-Solving questions to assess children’s success across this unit. Go to the next slide.
Year 3

31. Problem solving and reasoning questions
Draw a 2-D shape with at least 1 curved side and 2 lines of symmetry.
How many lines of symmetry in a regular pentagon?
Can you draw a…
• 4-sided shape with exactly 2 right angles?
• Hexagon with every side a different length?
• Regular octagon?
Draw a ring around any regular polygons:
Year 3

32. Problem solving and reasoning: Answers
Draw a 2-D shape with at least 1 curved side and 2 lines of symmetry. Shape may be ovoid, or resemble a ‘rounded’ rectangle, e.g.
How many lines of symmetry in a regular pentagon? 5.
These go from each of the 5 vertices to the mid-point of the opposite side
Can you draw a…
• 4-sided shape with exactly 2 right angles? Yes, various possibilities, e.g
• Hexagon with every side a different length?
Yes, various possibilities, check.
• Regular octagon?
Yes, all sides and angles should be equal.
Year 3

33. Problem solving and reasoning: Answers cont’d
Draw a ring around any regular polygons:
square
hexagon
heptagon
equilateral triangle
pentagon
Year 3