Mental Maths Hints

(2D Shape Facts)Dear Parents,This week the children are exploring 2D shapes. The table below outlines the different properties of 2D shapes. It would be useful for your child to go over these shape facts each night so that their understanding of 2D shape and their recall of shape facts improves.

You could play the ‘Who am I’ shape game. For example you could ask your child:

I have 5 facesI have 5 vertices Who am I?

Answer = A pentagon.

Use the following websites for further guidance:

https://www.bbc.co.uk/bitesize/topics/zvmxsbk

https://www.splashlearn.com/math- vocabulary/geometry/shape

https://www.theschoolrun.com/what-are-the-names-of-2d-and-3d-shapes

Mr QuinnPrimary 5

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Mental Maths Hints – 2D Shape Facts

Name of the shape : Picture of the shape :

Circle

Semi - circle

Oval

Triangle

Square

Rectangle

Parallelogram

Rhombus

Trapezium

Kite

Pentagon

Hexagon

Heptagon

Octagon

Nonagon

Decagon

What is an equilateral triangle?

An equilateral triangle has three equal sides and three equal angles.

What is a scalene triangle?

A scalene triangle's three sides are all unequal.

What is an isosceles triangle?

An isosceles triangle has two equal sides and two equal angles.

What is a right-angled triangle?

A right-angled triangle has an angle that measures 90º.

Yellow

Using the list of words below, write down the name of each of these shapes:

rhombus kite hexagon trapezium pentagon isosceles triangle arrowhead semicircle circle decagon parallelogram octagon

Blue 1

Which of these shapes is not a quadrilateral? Write the name of each quadrilateral.

Which of these is a hexagon? Explain your answer.

Draw a pentagon.

These triangles are made using matches. What is the name of each triangle? Can you make an isosceles triangle using 10 matches?

Match the names to the descriptions

Link the prefixes to the numbers

How many lines of symmetry does each quadrilateral have?

Write down the names of the three quadrilaterals that have diagonals crossing at right-angles. (Try sketching them).

Which shape is not a polygon? Circle the correct letter.

For use with Schofield & Sims Maths Rapid Tests © Schofield & Sims Ltd, 2018.

How many shapes?1. Howmanytrianglescanyousee?

2. Howmanyrectanglescanyousee?

MathsRapidTests Puzzles

3. Lookatthisshape.

a) Howmanytrianglescanyousee?

b) Howmanyrectanglescanyousee?

1. Daisyisbuildingtowers.Someofherblocksareorangeandsomeareblue.Ifshebuildstowersthatarealways4blockshigh,howmanydifferentcolourcombinationsof4-blocktowerscouldshebuild?

2. Daisy’smumgiveshersomeredblockstoaddtoherorangeandblueblocks.Howmanydifferent4-blocktowerscouldshemakenow,ifshehasatleastoneofeachcolourineachtower?

Building towers

Blue 2

Draw a kite

Draw a trapezium

Draw a rhombus

What am I? • I have 1 side • I have no corners • I have no parallel sides • I only have one curved edge

What am I? • I have 4 side • I have no lines of symmetry • I have 2 pairs of parallel sides

What am I? • I have 3 side • I have 1 line of symmetry • I have 2 equal sides • I have 2 equal angles

Who has the combined largest number of sides? Show your working out. Ben has a hexagon and a trapezium. Jem has a parallelogram and an octagon. Millie has a nonagon and a triangle.

Which has the largest number of sides? Octagon heptagon decagon trapezium

trapezium parallelogram square

rhombus rectangle

For one of these quadrilaterals,

the corners are not right angles, the quadrilateral has rotational symmetry of order 2 and

the diagonals cross at right angles.

Write down the name of this quadrilateral.

Which has the least number of sides? Pentagon parallelogram nonagon heptagon

Pink

Dana is describing a quadrilateral.

The rhombus is one possible quadrilateral she could be describing.

Write down the names of the other two quadrilaterals she could be describing.

Answer _______________ and _______________

Draw two straight lines inside the rectangle to split it into

1 trapezium and 2 right-angled triangles. Put your answer on this diagram.

Find as many polygons as you can in this image. Name each one and say if it looks regular.

Tick (✓) or cross (✕) the properties of the quadrilaterals shown. The square has been done as an example.

Property

Diagonals cross at

right angles

One pair of equal opposite

angles

All sides equal

Exactly one line

of symmetry

Rotational symmetry of order 2

Square ✔ X ✔ X X

Rhombus

Kite