




1. 
For each chapter in your textbook, there is one online Brain Teaser. If you get stuck, click on the Hints button for a strategy to help solve the question. Once you find the answer to the question, click on the Solution button to see if you are right.

2. 
The hints often suggest problemsolving strategies. Here are some of the strategies you might try:
 Write a Number Sentence
 Write an Equation
 Draw a Picture
 Make a Table
 Act It Out
 Guess and Check
 Find a Pattern
 Work Backward
 Make a List
 Solve a Simpler Problem
 Choose a Strategy
 Use Logical Thinking

3. 
In solving the Brain Teasers, try this fourstep procedure: Understand, Plan, Solve, and Look Back.
Understand
 What is the question?
 What facts do you know?
Plan
 Have you ever solved a problem like this before?
 If you missed something, try the problem again.
Solve
Look Back
 Do the answers match the facts in the problem?
 If you missed something, try the problem again.

