Group Activity Cards

Statistics and Probability Use groups of 2.

Sorry, Wrong Number

Read the following.

Each region of the United States has its own three-digit area code. If you dial the seven-digit telephone number of someone in another region, you will get the wrong number if you didn't remember to dial the area code first. The first digit of each area code can be any of the following digits: 2, 3, 4, 5, 6, 7, 8, 9. The second digit must be 0 or 1. The third digit can be any digit from 1 through 9.

Use a tree diagram to find all of the possible area codes.