## Reflection: Developing a Conceptual Understanding Where On The Line? - Section 1: Creating Number lines

The Common Core standards suggest the use of number lines as a strategy for solving math problems. Second graders should leave second grade with a variety of strategies for solving math problems. They should feel confident using and explaining those strategies (MP5).

Often, commercial number lines used in classrooms are shown with the numbers 1 - 20 written on them. Students think of the number line as a strategy for low numbers. By using an open number line (no numbers on it), students can see that the number line can be a useful tool for harder problems, and it can also be easily drawn when they need a visual to help them see how the numbers they are dealing with are related. Students started today with a completely blank line. Together we did fill in the line but only counting by 10 so students then had to visualize where numbers where between these  landmarks other numbers would lie.

This lesson could be done earlier in the year, but it is also a good way to end the year by reinforcing a strategy that students have used, but have not extended to the larger numbers they are now dealing with.

Number Line Strategy
Developing a Conceptual Understanding: Number Line Strategy

# Where On The Line?

Unit 18: Strategies That Work
Lesson 7 of 16

## Big Idea: Do you know where a number would be? Can you use a number line as a tool to solve problems?

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Standards:
Subject(s):
Math, Number lines , Number Sense and Operations, Operations , addition, subtraction, review, estimation
55 minutes

### Beth McKenna

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