ME5-9: Millimetres and Centimetres
page 257
lf you look at a ruler with millimetre markings, you can see that 1 cm is
equal to 10 mm.
Ocm
1
2
3
4
How long is the line in cm? How lonq is it in mm?
5
The line is
cm long, or
mm long.
To convert a measurement from cm to mm,
we have to multiply the measurembnt by
1
.
Your index finger is about 1 cm or i 0 mm wide.
Measure the objects below using your index finger.
Then convert your measurement to mm.
a)
b)
€
The paper clip measures about
index fingers
So, the paper clip is approximately
'-
The rectangle measures about
mm long
So, the rectangle is approximately
index fingers.
_
mm long
Measure the distance between the two arrows on each ruler
a)
b)
Omm 10
20
30
40
50
mm
3.
Measure the sides of the rectangle in cm.
Then measure the distance between the two diagonal
corners in cm and mm.
NOTE: Your answer in cm will be a decimal.
cm
B
cm
Use a ruler to draw the following objects to the exact millimetre.
a)
A line 20 mm long.
b) Draw a line 52 mm long.
c)
A beetle 35 mm long
d)
jump moth
A pencil 70 mm long.
page 258
ME5-9: Millimetres and Centimetres
5.
@ontrnued)
mm or more than 40 mm'
Estimate whether each line is less than 40
Place a checkmark in the appropriate column'
Then measure the actual length'
a--'
i|
Less than 40
mm i| More than 40 mm
--*-*
-
\
i
b)
mm
a)
into mitimetres (mm), what should you multiplv
a measurement from centimetres (cm)
the measurement bY?
6. To change
chafis.
Fill in the numbers missing from the following
7,
1
-1
I
I
9.
-*---
|
213
- 1---"- 1 18
__J
what should you divide by?
To change a measurement from mm to cm
g.
G
i
iir
iil
mmicm
l*"
ie
Change the measurements'
a)
10. Circle the greater measurement
in each pair'
HINT: Convert one of the measurements so
your work'
that both units are the same' Show
a)
5cm
70 mm
b)
83 cm
910 mm
c)
45 cm
53 mm
d)
2cm
12 mm
e)
60 cm
6200 mm
@. iutp
@
moth
"-,P.,."'"""',..
c)
b)
460 mm =
11.
Draw a rectangle 2 cm high and 50 mm long'