1. Implementation
Review the mathematical concept.
Review the problem solving steps.
READ: Children read the part that is asking them to find something out.
UNDERSTAND: Children explain what they need to find out.
Children identify what information they will need to find it out.
Remove the coloured rectangle.
Children find the information they need to find it out.
CHOOSE A STRATEGY: Children identify strategies that they could use to find it out.
USE A STRATEGY: Children use a strategy to find it out.
Children record their thinking as they find it out.
CHECK: Children reread the part that asked them to find something out.
Children check that they have found it out.
Children check they have recorded their solution correctly.
Children follow the problem solving steps to solve the 2nd level of the problem, with minimal teacher guidance.
Children who solve the 2nd level, follow the problem solving steps to solve the 3rd level of the problem independently.
Children use the problems as a guide to create their own problem, either alone or in pairs/small groups.
Children solve their own problem.
Throughout the lesson, children share solution strategies.
At the end of the lesson, children explain how they created their own problems.

2. Measurement and Geometry 19
Problem Solving
Equal Arm Balances
Jill compared the mass of 2 objects on an equal arm balance.
Which object is heavier? How do you know?
Jill compared the mass of 2 objects on an equal arm balance.
Which object is lighter? How do you know?
Jill compared the mass of 2 objects on an equal arm balance.
How could you describe the masses of the objects?
Measurement and Geometry 19
Create your own problem! Now solve it!

3. Measurement and Geometry 19
Problem Solving
Equal Arm Balances
Jill compared the mass of 3 different objects on an equal arm balance.
Which object is the heaviest?
Jill compared the mass of 3 different objects on an equal arm balance.
Which object is the lightest?
Jill compared the mass of 3 different objects on an equal arm balance.
Which object is the heaviest?
Measurement and Geometry 19
Create your own problem! Now solve it!

4. Measurement and Geometry 19
Problem Solving
Equal Arm Balances
Jill compared the mass of 4 different objects on an equal arm balance.
Which object is the heaviest?
Jill compared the mass of 3 different objects on an equal arm balance.
Which object is the lightest?
Jill compared the mass of 3 different objects on an equal arm balance.
Which object is the heaviest?
Measurement and Geometry 19
Create your own problem! Now solve it!

5. Measurement and Geometry 19
Problem Solving
Equal Arm Balances
Maryann had a small, heavy object.
What object could she have?
Alex had a large, light object.
What object could he have?
Lucy had a small, light object.
What object could she have?
Larry had a large, heavy object.
What object could he have?
Measurement and Geometry 19
Create your own problem! Now solve it!

6. Measurement and Geometry 19
Problem Solving
Equal Arm Balances
I have these 2 boxes.
One box is heavy and one box is light.
What might be in the boxes?
I have these 2 boxes.
Both boxes are heavy .
What might be in the boxes?
I have these 2 boxes.
Both boxes are light .
What might be in the boxes?
Measurement and Geometry 19
Create your own problem! Now solve it!