## Reflection: Developing a Conceptual Understanding Place Value and the Number Line - Section 2: Active Engagement

The use of a number line not only helps students use a tool to solve math situations, but they also help students develop the necessary number sense to construct mathematical meaning and numerical relationships.

I find that using number lines helps my students build their mental math ability, create models to defend their thinking, and to explore relationships between operations.

In this lesson, the number line is the right choice, as students can visually see that there are many, many ways to reach the same number, but that there is also an efficient strategy, which is the expanded form.

Why Use a Number Line
Developing a Conceptual Understanding: Why Use a Number Line

# Place Value and the Number Line

Unit 9: Place Value
Lesson 2 of 10

## Big Idea: Using place value and expanded notation knowledge is necessary in developing mental math ability. This lesson explores the number line as a tool to solutions to larger number addition problems.

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10 teachers like this lesson
Standards:
Subject(s):
Math, Number lines , Number Sense and Operations, addition, strategies, expanded notation, number patterns
45 minutes

### Michelle Marcus

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