3. Mass – The amount of matter contained in an object. Units of mass: gram – g kilogram – kg tonne - t 1000 g = 1 kg 1000 kg = 1 t

5. The total mass of an object including its contents and packaging.

7. The total mass of an object not including its packaging.

8. 4 different activities Approximately 8 minutes per activity Activity 1 – Using Scales Activity 2 – Filling in the blanks Activity 3 – Word Problems Activity 4 – Questions

9. Quiz Net mass is; - The mass of the packaging - The mass of the product inside the packaging - The same as gross mass If the gross mass is 320g and the net mass is 300g. What is the mass of the packaging? A bag of rice has a net mass of 1kg. The packaging has a mass of 80g. What is the gross mass? – 1.8kg – 180g – 1080g What has a greater/larger mass? – The net mass – The gross mass