Reflection: Connection to Prior Knowledge Transforming to Compute Smaller Numbers - Section 2: Teacher Demonstration

 

While students were solving 609 + 247, this student excitedly shared, "Mrs. Nelson! I'm using yesterday's strategy too!" I couldn't wait to see! Here's the conference that took place next. You'll see that she is transforming (adjusting both addends) and later compensating (adjusting one addend and then the solution later on): Tranforming and Compensating

I just had to celebrate her in front of the the class! In no time, other students were trying to use both strategies! 

  Connection to Prior Knowledge: Reflection
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Transforming to Compute Smaller Numbers

Unit 5: Adding & Subtracting Large Numbers
Lesson 13 of 16

Objective: SWBAT use transformation to check the addition and subtraction algorithms for accuracy.

Big Idea: Students will adjust both addends or both the subtrahend and minuend to make computation easier.

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