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. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
Mira drew this metric measurement chart.
What unit of measurement is missing?
Mira drew this metric measurement chart.
What unit of measurement is missing?
Mira drew this metric measurement chart.
What unit of measurement is missing?
Measurement and Geometry 47
Create your own problem! Now solve it!

3. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
Arnold measured the mass of an object using a set of scales. What is the mass of the object?
Arnold measured the mass of an object using a set of scales.
What is the mass of the object?
Arnold measured the mass of an object using a set of scales.
What is the mass of the object?
Measurement and Geometry 47
Create your own problem! Now solve it!

4. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
Jill measured the mass of an object. Is the mass of the object (a) kilogram (b) kilogram (c) kilogram
Jill measured the mass of an object. Is the mass of the object (a) kilogram (b) kilogram (c) kilogram
Jill measured the mass of an object. Is the mass of the object (a) kilogram (b) kilogram (c) kilogram
Measurement and Geometry 47
Create your own problem! Now solve it!

5. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
Jill measured the mass of an object. Is the mass of the object (a) kilogram (b) kilogram (c) kilogram
Jill measured the mass of an object. Is the mass of the object (a) kilogram (b) kilogram (c) kilogram
Jill measured the mass of an object. Is the mass of the object (a) kilogram (b) kilogram (c) kilogram
Measurement and Geometry 47
Create your own problem! Now solve it!

6. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
Betty measured the mass of an object.
She found it had a mass of about 1 kilogram.
What could be Betty’s object?
Betty measured the mass of an object.
She found it had a mass of about 1 gram.
What could be Betty’s object?
Betty measured the mass of an object.
She found it had a mass of about half a kilogram.
What could be Betty’s object?
Measurement and Geometry 47
Create your own problem! Now solve it!

7. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
Sue measured the mass of her dog.
Which could be closest to the mass of her dog?
(a) 1 gram
(b) 1 kilogram
Sue measured the mass of her pencil.
Which could be closest to the mass of her pencil?
(a) 1 gram
(b) 1 kilogram
Sue measured the mass of her laptop.
Which could be closest to the mass of her laptop?
(a) 1 gram
(b) 1 kilogram
Measurement and Geometry 47
Create your own problem! Now solve it!

8. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
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 47
Create your own problem! Now solve it!

9. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
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 47
Create your own problem! Now solve it!

10. Mass in Grams and Kilograms on Scales
Problem Solving
Mass in Grams and Kilograms on Scales
Maryann had a small object that had a mass heavier than 1 kilogram.
What object could she have?
Oliver had a large object that has a mass of about 1 gram. What object could he have?
Oliver had a small object that has a mass of about 1 gram. What object could he have?
Maryann had a large object that had a mass heavier than 1 kilogram.
What object could she have?
Measurement and Geometry 47
Create your own problem! Now solve it!