1. Bell Work

2. Today you will think about how to find a mystery number based on information given to you as part of a game. In the game, you will practice mental-math computations and will investigate ways to represent different situations. When you solve the number-game puzzles, you also might use a skill called reversing your thinking. Reversing is an important way of thinking mathematically. It means solving problems both backward and forward. As you work with your team, ask each other these questions: How can we represent it? What is the best approach for this problem? Have we found all of the answers?

3. 1-16. GUESS MY NUMBER Today you will play the “Guess My Number” game. A pencil and a piece of paper may come in handy as you play the game. Each game below gives clues to a mystery number. Your task has two parts. First, figure out what the number is. Second, explain why you think it is the mystery number. Game #1: When I triple my number and add five, I get eleven. What is my number? Game #2: When I add two to my number and then multiply it by five, I get thirty. What is my number? Game #3: When I take half of my number and add two, I get twenty-four. What is my number?

4. 1-16. GUESS MY NUMBER Today you will play the “Guess My Number” game. A pencil and a piece of paper may come in handy as you play the game. Each game below gives clues to a mystery number. Your task has two parts. First, figure out what the number is. Second, explain why you think it is the mystery number. Game #4: When I double my number and add eight, I get my number plus twelve. What is my number? Game #5: When I double my number, add four, and then subtract my number and subtract three, I get my number plus one. What is my number? Game # 6: When I triple my number and add six, and then subtract twice my number, I get my number plus three. What is my number?

5. 1-17. Make up your own “Guess My Number” games with your team and be ready to share them with the class. Make at least one game that has only one answer. Also make one that works for all numbers. Can you create a game that does not work for any number?

6. 1.5. 2.6. 3.7. 4.8. Practice