Number Line
Lab 1 - Adding with the 123 Robot

Teacher Portal

### Active Share

1. Facilitate the students combining their 123 Fields to create a class number line together across the room.
1. Encourage each group to relabel the numbers on their own section of the new larger number line.
2. Teacher Tip: Cue the group to the impending transition by reminding them of time winding down, and what will happen next. Things like “Start wrapping up, in 5 minutes, we are going to get ready to combine our number lines.” State the expectation for the time remaining, and what they can expect moving forward.
2. Write a large multi-step addition problem on the whiteboard for students to see. For example: 2+4+3+6+5=?
1. Ask students how they would go about solving this problem on our new, bigger number line.
3. Solve the problem step by step with one 123 Robot.
1. Have the students count aloud together with each button press to reinforce the 1 : 1 correlation between the robot movements and the button presses.
2. Each group will be responsible for one section of the equation. If you have five groups in class, write an equation with five steps (for example: 1 + 3 + 2 + 3 + 4 + 2). Each group will add one number from the equation in turns on the same 123 Robot and class number line. This will allow them all to use the same tools and teamwork to solve a large addition problem.

### Discussion Prompts

Digital Documentation

• Teachers can use video to record the process during Play Part 2 of the groups independently solving addition problems.

Student-Driven Visible Thinking

• Write down student's words as they identify and describe the mathematical thinking about solving problems with the 123 Robot and the number line. Hang these quotes in the classroom to remind students of the strategies and thinking that they used, when they are doing other addition problems.

Metacognition-Reflecting Together

• Journal Prompts: What is one thing that was challenging for you? One thing that you learned from this experience?
• Process Question: How did you decide where to place the 123 Robot on the number line to start to solve an equation?
• Collaborating Question: What is one way your group were good problem solvers today?