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

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