standard_description: Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
problem_activity: Narrative
The purpose of this activity is for students to choose from activities that focus on addition and subtraction within 10. Students choose from any stage of previously introduced centers.
Math Stories
Shake and Spill
What’s Behind My Back
Required Materials
Materials to Gather
Materials from previous centers
Required Preparation
Gather materials from previous centers:
Math Stories, Stage 4
Shake and Spill, Stage 3 and 4
What's Behind My Back, Stage 2
Launch
Groups of 2
“Now you are going to choose from centers we have already learned.”
Display the center choices in the student book.
“Think about what you would like to do first.”
30 seconds: quiet think time
Activity
Invite students to work at the center of their choice.
15 minutes: center work time
Student Facing
Choose a center.
Math Stories
[IMG]
Shake and Spill
[IMG]
What's Behind My Back
[IMG]
Activity Synthesis
“What is one thing you learned or got better at by working on the activities you chose?”


aligns: no