1. Topics MEASURING LENGTH UNITS TO MEASURE LENGTH UNITS CONVERSIONS
LET’S DO CONVERSIONS
EXERCISE - 1
EXERCISE - 2
ADDITION OF LENGTHS
SUBTRACTION OF LENGTHS
EXERCISE - 3

2. Length is a measure of how long or wide something is.
MEASURING LENGTH
Length is a measure of how long or wide something is.
Rulers and tape measures can be used to measure length.
Rulers
Tape

3. Distances traveled by bike Distances between two bus stops
UNITS TO MEASURE LENGTH
Length is measured in millimeters (mm), centimeters (cm), meters (m) or kilometers (km).
Kilometers is used to measure even longer length such as:
Meters is used to measure length of objects such as:
Millimeters (mm) and centimeters (cm) are used to measure smaller objects such as:
Distances traveled by bike
Distances between two bus stops
Distances between school and home
8 cm
13 mm
7 metres
7.5 metres
9 mm
5.5 metres

4. UNITS CONVERSIONS
Centimeter to Millimeters
1 cm = 10 mm
Kilometer to Meters
1 km = 1000 m
Meter to Centimeters
1 m = 100 cm
Kilometer to Centimeters
1 km = 1000 m = 100,000 cm
Meter to Millimeters
1 m = 100 cm = 1000 mm

5.  825 centimetres = 8 metres 25 centimetres.
LET’S DO CONVERSIONS
Point to remember:
To convert centimetres to metres, divide by 100. In result, the quotient is metres and the remainder is centimetres.
Convert 825 centimetres to metres.
To convert metres to kilometres, divide by In result, the quotient is kilimetres and the remainder is metres.
metres
Convert 5064 metres into kilometres.
kilometres
centimetres
metres
 825 centimetres = 8 metres 25 centimetres.
 5064 metres = 50 kilometres 64 metres.

6. 6,542 centimetres 905 centimetres 800 centimetres 1,008 centimetres
EXERCISE - 1
Express in metres and centimetres.
6,542 centimetres
905 centimetres
800 centimetres
1,008 centimetres
245 centimetres
10 metres 8 centimetres
65 metres 42 centimetres
2 metres 45 centimetres
9 metres 5 centimetres
8 metres

7. 25,105 metres 4,505 metres 50,025 metres 55,333 metres 5,005 metres
EXERCISE - 2
Express in kilometres and metres.
25,105 metres
4,505 metres
50,025 metres
55,333 metres
5,005 metres
6,000 metres
55 kilometres 333 metres
50 kilometres 25 metres
25 kilometres 105 metres
4 kilometres 505 metres
5 kilometres 5 metres
6 kilometres

8. ADDITION OF LENGTHS Point to remember:
Write kilometres under kilometres, metres under metres, centimetres under centimetres and milimetres under milimetres.
Perform simple addition.
Example: Add 5 m 75 cm and 12 m 34 cm.

9. SUBTRACTION OF LENGTHS
Point to remember:
Write kilometres under kilometres, metres under metres, centimetres under centimetres and milimetres under milimetres.
Perform simple subtraction.
Example: Subtract 5 m 75 cm from 12 m 34 cm.

10. Add 6 m and 5 m 5 cm. 11 metres 5 cm 82 cm 20 mm 21 km 88 m 7 cm 88 mm
EXERCISE - 3
Add 6 m and 5 m 5 cm.
Subtract 53 km 42 m from 75 km 30 m.
Subtract 5 m 40 cm from 12 m 18 cm.
Subtract 22 cm 12 mm from 30 cm.
Add 25 km 40 m and 55 km 78 m.
Add 12 cm 15 mm and 70 cm 5 mm.
11 metres 5 cm
82 cm 20 mm
21 km 88 m
7 cm 88 mm
6 m 78 cm
81 km 18 m