Length
and
UNITS OF
MEASUREMENT
LESSON TARGET:
Understand that there are different
measuring units and that those units
can be converted into other units.
1.
What is length?
2. When I want to know
how long something is,
what do I do?
Length can be measured in
different units.
millimeter
mm
centimeters
cm
meters
m
kilometer
km
When we look at a ruler which 2 units can
you spot on it ?
When we want to measure the length of a
wall, what unit do you think we could use?
What unit would we use if we wanted to
measure how far a car has driven?
measuring tools:
trundle
wheel
Ruler
measuring
tape
speedometer
CONVERSION:
E
N
O
E
K
A
T
E
E
G
N
W
A
N
H
E
C
H
D
W
N
S
A
I
T
N
I
T
I
O
N
I
N
U
S
U
R
T
R
E
N
E
V
E
H
N
M
T
O
E
O
C
R
N
U
A
S
O
A
T
N
ME
I
IT
10 mm = 1 cm
100 cm = 1 m
1000 m= 1 km
Read the following rhyme.
King
henry
died of a
Miserable
disease
Called
Measles
km
m
cm
mm
Km H D M D Cm Mm
Km H D M D Cm Mm
10 mm = 1 cm
100 cm = 1 m
1000 m= 1 km
Km H D M D Cm Mm
500. (m)
I measured 500m now I want to convert
it into km.
To do this we will use the following
steps.
Step 1: check
Step 2: point to where we want to go
There is always an invisible decimal point
at the and of numbers.
Step 3: Jump
Km H D M D Cm Mm
0,5 0 0. (m)
There is always an invisible decimal point
at the and of numbers.
After we completed these steps we can
move on to converting our number.
The spaces we counted between the
units will indicate how many spaces our
decimal point will move and the direction
that it will move.
Lets practice:
25cm to mm
50mm to cm
2000m to km
K H
D
M
D C
M
When we want to record measurements we write
down the number and the unit.
The length of this room is 6m and 35cm.
6m
Length (how long?)
35cm
width (how wide?)
How do we measure?
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
cm