Page 2 - Lesson note 2

Conversion of lengths

Learning Objective – Students will be able to learn about conversion of lengths.

Explanation
Length tells us how long an object is. We will learn about 3 units of measuring length.
1) Smaller unit - Centimetre (cm)
2) Standard unit – Metre (m)
3) Larger unit – Kilometre (km)
1 m = 100 cm
1 km = 1000 m

Conversions:
A) To convert meters into centimeters, we multiply the given number of meters by 100.
Example 1: Convert 5m into cm
5m = 5 x 100
= 500cm
Example 2: Convert 4m 85cm into cm
4m 85cm = 4 x 100cm + 85cm
= 400cm + 85 cm = 485 cm
B) Convert into metres and centimetres.
Example: Convert 688 cm into m and cm
688 cm = 600 cm + 88 cm
= 6 m + 88 cm
= 6 m 88 cm
C) To convert kilometers into meters, we multiply the given number of kilometers by
1000.
Example 1: Convert 15km into m
15m = 15 x 1000
= 15000m
Example 2: Convert 4km 850m into m
4km 850m =4 x 1000m + 850m
= 4000m + 850m
= 4850m
D) Convert into kilometres and metres.
Example: convert 3991 m into km and m
3991 m = 3000 m + 991 m
= 3 km + 991 m
= 3 km 991 m
Learning Outcome – Students are able to learn about conversion of lengths.