TIPS

1. Length is the distance between two points along a straight line.


2. Relationship between units of length
   • 1 cm = 10 mm
   • 1 m = 100 cm
   • 1 km = 1 000 m
   Example:Convert 3.25 km to m.
   Solution:
   

   3.35 km	=3.15 x 1 000 m
   	= 3 250 m



3. The mass of an object can be measured by using weighing scale.


4. Relationship between units of mass
   • 1 kg = 1 000 g
   Example:Convert 5 820 g as a decimal of a kg.
   Solution:

   5 820 g	= 5 820 g / 1 000 g
   	= 5.82 kg

COMMON MISTAKES

1. State the mass, in kg and g, of the tin of lychee, as shown in the diagram.
   Incorrect :
   
   Correct: