## Reflection: Developing a Conceptual Understanding Subtracting Using dots, bars, squares and rectangles as a place value model. - Section 6: Assignment

This lesson is truly a good one! I think the place value block drawings really helped struggling students see the regrouping while supporting the language. I also think it keeps the high level student who really mastered the motions but not the explanation!

I can't think of a better way for this developmental level to transform it all into a solid well calculated standard algorithm. I saw smoothness in their subtraction and clear placement of the regrouped numbers. I am so committed to making sure the problem is clearly demonstrating how the regrouping is taking place by the placement of the regrouped sets of tens. Short cuts are fine, but not when they impede on mastering a standard to the depth of understanding that needs to be accomplished with CCSS! It's math power!

Good Lesson!
Developing a Conceptual Understanding: Good Lesson!

# Subtracting Using dots, bars, squares and rectangles as a place value model.

Unit 1: Place Value and Multi-Digit Addition & Subtraction
Lesson 1 of 7

## Big Idea: Students use a simple method of using pictures that represent place value to subtract.Then they will transfer the concept to a standard algorithm .

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50 minutes

### Mary Ellen Kanthack

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