The document outlines the four steps to solve problems: 1) understand the problem, 2) plan how to solve it, 3) carry out the plan, and 4) look back at the answer. It then works through an example problem of determining how many people saw the whole Harry Potter movie given the total attendees and those that left halfway. The document solves the problem by subtracting the number of people that left from the total attendees.

1. Can you remember the four
steps?

2. 1. Understand the problem
2. Plan how to solve the problem
3. Carry out the plan
4. Look Back

3. On the 3rd of December 532 people
went to see the new Harry Potter
movie. Half way through the movie
67 people left because they didn’t
like it. There were 213 kids in the
audience. How many people saw the
whole film?

4. 1. Understand the problem
What information don’t we need?
What is the question?
What is the important information?
On the 3rd of December 532 people
went to see the new Harry Potter
movie. Half way through the movie 67
people left because they didn’t like it.
There were 213 kids in the audience.
How many people saw the whole
film?

5. 2. Plan how to solve the problem
What strategy will we use?
Solving an equation?
Subtraction -
3. Carry out the plan

6. 2-7 = can’t do 4 12 12
532
12-7 = 5
20-60 = can’t do - 67
120-60 = 60 465
400-0 = 400

7. 4. Look Back
Is our Answer reasonable?
YES
Write your answer in a sentence.
4 6 5 p e o p le
s a w t h e w h o le
H a rry P o tte r