[list=1][br][*]List the steps you used to fill in the blanks in the beginning. [br][br][*]How did your strategy change during your exploration? [br][br][*]What steps will you tell your friends to use so they can quickly fill in the blanks?[br][br][*]Write a rule to fill in the blanks using "A" and "B" that can be used for any numbers. [br][br][*] [b]Challenge: [/b]Write a rule that your friends can use to find the value of C. Test your rule using the Decimal level.[br][br][/list]