•  Using Bar Models: The Four Operations

In Chapter 6, students continue their learning about bar models.  In Grade 2, students have learned to solve one-step and two-step word problems involving addition and subtraction.  In Chapter 3, this was extended to word problems involving addition and subtraction of 4-digit numbers.  Part-whole models were used to illustrate the concepts of part-whole and adding or taking away sets, while comparison models were used to illustrate the concepts of more than or less than.  A combination of both types of models may be used to solve two-step problems.  In addition, students were introduced to the four-step problem-solving model.
In this chapter, both multiplication and division are based on the concept of equal groups, or the part-whole concept where each group of the unit - is one part of a whole.  Students will learn how to use a unitary approach to represent such a situation.  Students will also see that a model can be used to show two steps, where some amount might be subtracted from the whole or added toequal groups.
Students have learned to compare two sets using the comparison model.  In this chapter, students will compare sets where one whole is a multiple of another whole.  This will be extended to compare up to three sets.
This chapter exemplifies application of the four operations.  Students will be able to show that they fully understand the four operations and how to use them in context of a real-world situation.  This will be a great asset for future math understanding.

Key Learning Objectives:
• Real-World Problems: Multiplication
• Real-World Problems: Division
• Real-World Problems: Four Operations

Online Games:

Disappearing Dinos

Bar Modeling Game