This document discusses measuring and comparing mass. It explains how to find mass in non-standard units and compares the mass of a father, child, and baby. Key terms like heavier, heaviest, lighter, and lightest are defined. Examples are given to show how objects with different masses can be measured and compared using units represented by balls, with the book having a mass of 3 units and the cup having 2 units.

1. Measurement
Length and Mass
What will we learn today?
• Finding mass in non-standard units
• Comparison of mass.

2. The baby is heavy.
The child is heavier.
The father is the heaviest of the three.

3. Mass can be measured and compared
using a fixed units.
We can also use the words
light
lighter
lightest
to describe mass.

4. 1 ball stands for 1 unit.
The book is 3 units.

5. 1 ball stands for 1 unit.
The cup is 2 units.

6. 1 ball stands for 1 unit.
The cup has a mass of 2 units.
The book has a mass of 3 units.
We can say that the book is heavier
than the cup by 1 units.
3 - 2 = 1

7. The object that goes down has a heavier
mass.

8. The object that goes down has a heavier mass.
Dannie is heavier than May.
May is lighter than Dannie.

9. Find the mass of the book.
The mass of the cup is 2 units.
The mass of the book will be 1 unit.
3 - 2 = 1

10. Are you ready to
try out the
questions?