Metric units

1 Howlongiseachline?

Giveyouranswerinbothcentimetresandmillimetres.

a)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

cm mm

b)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

cm mm

c)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

cm mm

d)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

cm mm

2 Completetheconversion. 1cm= mm

3 Dexterisconvertingunitsofmeasure.

CompleteDexter’sworkingstoshowthatheiscorrect.

WhatotherconversionscouldyouworkoutusingDexter’smethod?

4 Completetheconversions.

a) 15cm= mm e) cm=0.2m

b) 12m= cm f) 4.65m= cm

c) 16.5m= cm g) 52,000mm= cm

d) mm=165cm h) 52,000mm= m

©WhiteRoseMaths2020

1 m = cm

1 cm = mm

so, 1 m = mm

If I know how many millimetres are in 1 cm, and how many centimetres are in 1 m, then I can work out how

many millimetres are in 1 m.

©WhiteRoseMaths2020

5 MoandRosiearemeasuringthelengthoftheplayground.

a) Whoseunitofmeasureismoreappropriate?__________________

Explainyouranswer.

b) Rosiehasmeasuredthelengthoftheplaygroundas563cm.

WhatanswerwillMogetinmetres? m

6 EvaandAmiraremeasuringthelengthofapaperclip.

a) Whoseunitofmeasureismoreappropriate?__________________

Explainyouranswer.

b) Amirhasmeasuredthelengthofthepaperclipas0.8cm.

WhatanswerwillEvagetinmillimetres? mm

7 Thetableshowstheheightsoffoursunflowers.

Sunflower A B C D

Height 0.86m 91cm 640mm 72cm

Putthesunflowersinorder,startingwiththeshortest.

8 Thedepthofaplankis15mm.

12oftheplanksarestackedontopof

eachother.

Whatisthedepthofthestackofplanks?

Giveyouranswerincentimetres.

cm

9 Dexteris146cmtall.

Annieis0.27mshorterthanDexter.

HowtallisAnnie?

Giveyouranswerinmetres.

m

10 Thethicknessofa20pcoinis2mm.

Tommystacks£4worthof20pcoinsontopofeachother.

Howtallisthestackofcoins?

Giveyouranswerincentimetres.

cm

I’m going to measure it in metres. I’m going to measure

it in centimetres.Mo

Rosie

I’m going to measure it in millimetres.

I’m going to measure it in centimetres.Eva

Amir

TW

ENTY

PENC

E