The purpose of this activity is for students to learn a new center called Mystery Number. One student picks 2 cards and makes a two-digit number without showing their partner. They give clues about the mystery number based on the sentence starters and their partner guesses the mystery number. Students continue going back and forth giving clues and guessing the number until the mystery number is identified. Then students switch roles. Students earn 1 point for each clue they get to help them identify the mystery number. The player with the lowest score after 5 rounds wins.

• “¿Cuáles pistas hicieron que el número de su pareja fuera más fácil de adivinar?” // “Which clues made your partner’s number easiest to guess?”

The purpose of this activity is for students to choose from activities that offer practice working with two-digit numbers. Students choose from any of the previously introduced stages of the listed centers. They are encouraged to choose the center that will be most helpful for them at this time.

• Mystery Number
• Get Your Numbers in Order
• Greatest of Them All

• “¿En qué se parecían los dos centros en los que trabajaron? ¿En qué eran diferentes?” // “How were the two centers you worked on alike? How were they different?”