standard_description: Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
problem_activity: Narrative
The purpose of this warm-up is to elicit the idea that students can create stories from a picture, which will be useful when students tell their own story problems in a later activity.
Launch
Groups of 2
Display the image.
“What do you notice? What do you wonder?”
1 minute: quiet think time
Activity
“Discuss your thinking with your partner.”
1 minute: partner discussion
Share and record responses.
Student Facing
What do you notice?
What do you wonder?
[IMG]
Student Response
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Activity Synthesis
“What story could we tell about this picture?” (There were 9 books on the table. Then a girl took away 4. How many books are left on the table?)


aligns: no