Number & Operations for Teachers 

Copyright David & Cynthia Thomas, 2009

    

Chapter/Section

Chapter Two: Whole Numbers & Integers: Addition & Subtraction

2.1  Whole Numbers: Modeling the Meaning of Addition and Subtraction

Objective

Use concept models to understand the meaning of addition and subtraction of whole numbers.

Overview

This lesson addresses the questions,

  • What is the meaning of addition of subtraction of whole numbers?
  • What is the logical basis for regrouping (i.e., carrying and borrowing)?

The Set Model and the Measurement Model are used to represent the ideas.

Readings

Set Model

Measurement Model

Homework

Exercises

Links

Investigate  Number Line Bars, Number Line Bars – Whole Numbers, and Number Line Arithmetic at the National Library of Virtual Manipulatives for Interactive Mathematics

http://matti.usu.edu/nlvm/nav/topic_t_1.html