The purpose of this activity is for students to learn Stage 3 of the Rectangle Rumble center and Stage 5 of the How Close? center to practice multiplying within 100. These are centers that previously were suggested, so if one of them has been used before, only introduce the center that is new to students. If both centers are familiar to students, consider giving them Center Choice Time or choosing one or more centers for students to play.

• “What strategies were you able to practice in these centers?” (I was able to use multiplication facts I know, to figure out facts that I’m still working on. I was able to practice some of the multiplication facts that I still need to work on.)

In this activity, students practice multiplying within 100 by playing a game of their choice. The game options are from previously introduced centers:

• Compare, Stage 3: Multiply within 100
• How Close, Stage 5: Multiply to 100
• Rectangle Rumble, Stage 3: Factors 1–10

If students had Center Choice Time in the last activity, consider having students design their own multiplication game with the materials used in the centers. Students could also use additional materials, such as number cubes, grid paper, and index cards, if they are available.

• “What did you enjoy about the game you played?” (Thinking about which numbers to multiply to get close to 100 without going over. Competing against my partner.)