standard_description: Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions.
problem_activity: Narrative
The purpose of this warm-up is to count on from a given number. As students count, point to the numbers posted so that students can follow along. To support students as they learn to count on, consider asking “What number comes after 3?” or providing a running start by counting “1, 2, 3…” and having students continue the count.
Launch
“Let’s count to 10.”
Count to 10.
Activity
“Now start at the number 3 and count to 10.”
Count on from 3 to 10.
Repeat 3–4 times starting with other numbers within 10.
Student Response
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Activity Synthesis
“We can start counting at numbers other than 1. When we count on, we think about what number comes next when we count.”


aligns: no