# Directions

- For each unit in your student book, there are two online Brain Teasers. 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. - The hints often suggest problem-solving 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

- In solving the Brain Teasers, try this four-step 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

- Try your plan.

## Look Back

- Do the answers match the facts in the problem?
- If you missed something, try the problem again.