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Calculate perimeters3-eu-west-1.amazonaws.com/smartfile/8f31e6980b1ab... · Rosie The perimeter is...

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Calculate perimeter 1 Work out the perimeter of each shape. a) perimeter = cm b) perimeter = mm c) perimeter = m 2 Rosie and Eva work out the perimeter of the shape below. Who is correct? How do you know? 3 Tick the shapes with a perimeter of 16 cm. © White Rose Maths 2019 5 cm 5 cm 3 cm 3 cm 8 cm 2 cm 40 mm 40 mm 20 mm 6 cm 4 cm 3m 6 + 4 = 10, so the perimeter is 10 cm. Rosie The perimeter is 20 cm. Eva 10 cm 6 cm 6 cm 2 cm

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Page 1: Calculate perimeters3-eu-west-1.amazonaws.com/smartfile/8f31e6980b1ab... · Rosie The perimeter is 20 cm. Eva 10 cm 6 cm 6 cm 2 cm. b) perimeter = What do you notice? 6 This rectangle

Calculate perimeter

1 Workouttheperimeterofeachshape.

a)

perimeter= cm

b)

perimeter= mm

c)

perimeter= m

2 RosieandEvaworkouttheperimeteroftheshapebelow.

Whoiscorrect?

Howdoyouknow?

3 Ticktheshapeswithaperimeterof16cm.

©WhiteRoseMaths2019

5cm

5cm

3cm3cm

8cm

2cm 40mm

40mm

20mm

6cm

4cm

3m

6 + 4 = 10, so the perimeter is

10 cm.

Rosie The perimeter is 20 cm. Eva

10cm

6cm

6cm

2cm

Page 2: Calculate perimeters3-eu-west-1.amazonaws.com/smartfile/8f31e6980b1ab... · Rosie The perimeter is 20 cm. Eva 10 cm 6 cm 6 cm 2 cm. b) perimeter = What do you notice? 6 This rectangle

b)

perimeter=

Whatdoyounotice?

6 Thisrectanglehasaperimeterof18cm.

Workoutthelengthofsidea.

perimeter=18cm

sidea=

4 Whichshapehasthelongestperimeter?Tickyouranswer.

Showallyourworkings.

5 Workouttheperimeteroftheseshapes.

a)

perimeter=

©WhiteRoseMaths2019

4cm

4cm

3cm3cm

20mm 20mm

20mm 20mm

20mm

6cm 6cm

2cm

8cm

3cm

5cm

7cm

2cm

9cm

70mm

80mm

20mm10mm

30mm

50mm

30mm

50mm

2cm

6cm

a

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