Ryan|Oliver|Paris| 31.3.20 LI: To calculate the perimeters ... · 8X3§Ryan|Oliver|Paris|...

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8X3§Ryan|Oliver|Paris|

Cian|Jaden|Tilly|Liam|M

erlin|Beatrice|Jess|Jas

mine|Toby|Daisy|Freya|

Jack|Leilani|Alfie|Liam|

Sol|Tracy|Janna|Holly|

Molly|Kacey|George|Ja

ke|Jared|Greig|Evie|Ow

en|Cameron

Wa|Poppy|Cameron Wo 8Y3§Freya|Zoe|Harry|M

egan|Ashley|Sophie|Lib

by|Lewis

E|Cherry|George|Izzy|T

om|Ben

J|Shanice|Emily|Lewis

K|Aaliyah|Finn|Evie|Elli

e|Harrison|Luca|Grace|

S|Jordan|Atley|Madison

|Beth|Alicia|Edyth

LI: To calculate the perimeters

of compound shapes

31.3.20

Good morning Y6! Today we are going to review what you already know

about perimeter and then work on calculating the perimeters of compound

shapes. Work through the presentation and complete the tasks on paper.

You will be able to check your answers after completing each task. On the

final slide is a challenge for each colour group. Try your best!

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

Starter

Calculate the perimeter of these shapes:

Perimeter

a. b. c.

d. e. f.

9m 300mm

0.5m25cm

(Regular hexagon)

80cm2𝑥

3𝑥 + 4

Hint: Take care to

check the units of

measurement.

With shape C, for

example, you

should convert

each of the given

lengths to a

single unit of

measurement.

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

Starter

Calculate the perimeter of these shapes:

Perimeter

a. b. c.

d. e. f.

9m 300mm

0.5m25cm

(Regular hexagon)

80cm2𝑥

3𝑥 + 4

a. 26cm

b. 28m

c. 105cm / 1.05m/

1050mm

d. 66cm

e. 660cm/6.6m

f. 10x + 8

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

https://www.youtube.com/watch?v=vqDpxwWehuE

Click on the link, or type it into your browser.

Tutorial video

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

All: Calculate a perimeter where all lengths are known.

Most: Calculate a perimeter where at least one side must be derived.

Some: Calculate the perimeter of a variety of shapes using their properties.

Keywords: Perimeter, compound shape, properties

Perimeter of compound shapes

Finding missing lengths

3cmWhat is a

compound?

What is a

compound shape?

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

Finding missing lengths

Perimeter = 26cm

A compound shape is a

shape made up of 2 or

more shapes. This shape

is a compound made up

of 2 rectangles.

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

Calculate the perimeters

on your paper

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

Perimeter of compound shapesCheck your answers 1. 34cm

2. 48m

3. 11cm or 110mm

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

4. 500m

5. 56cm

6. 314mm

Check your answers

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

7. 44m

8. 88cm

9. 100mm or 10cm

Check your

answers

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

31-Mar-20

Challenge:

Red group: Orange/Yellow groups:

A plan of a play area is shown below:

a) Calculate the length of x and y.

b) Calculate the perimeter of the play area.

Here is a square.

Inside the square is an equilateral

triangle.

The perimeter of the triangle is

Find the perimeter of the square.

en|Cameron

by|Lewis

om|Ben

|Beth|Alicia|Edyth

Challenge answers:Orange/Yellow groups:

a) The length of the play area is 20m, so x = 20 - 8 = 12m.

The width of the play area is 15m, so y = 15 - 5 = 10m.

b) Perimeter = 8 + 5 + 12 + 10 + 20 + 15 = 70m.

Red group:

The triangle is an equilateral triangle, so all the sides measure the same length.

The perimeter is 54cm.

54cm divided by 3 sides = 18cm per side.

The base of the square measures the same as one side of the triangle.

It therefore measures 18cm also and because a square has 4 equal sides,

18+18+18+18 = 72cm

Ryan|Oliver|Paris| 31.3.20 LI: To calculate the perimeters ... · 8X3§Ryan|Oliver|Paris|...

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