## Reflection: Student Ownership Subtracting Using dots, bars, squares and rectangles as a place value model. - Section 2: Start Change Result and Math Mountain Strategies At Work

Math Mountain and Start, Change, Result Strategies:  We so often see students make the mistake of not understanding how their fact families really work. They may have memorized them, but do not understand the role of the total in relationship to the addends. Standards for Practice #1 expect that mathematically proficient students start by "explaining to themselves the meaning of a problem and looking for entry points to its solution." If they don't understand the role each number plays within the equation, they will continue to make mistakes in solving problems. You will see it all in practice as you view the slides on the Smart Board File Resource.I love these two strategies and see my students using them over and over. It has served as a great tool for all levels of students. This makes your higher end students who may avoid thinking or explaining concepts because they just "get it", explain it well. It supports thinking for lower end students who really need guidance in critical thought.

Understanding How Math Mountains and Start Change and Result Strategies help students.
Student Ownership: Understanding How Math Mountains and Start Change and Result Strategies help students.

# 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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