# Using the Open Numberline in Guided Math Groups: Part 2

The open number line is a powerful tool to scaffold the development of mathematical proficiency, specifically conceptual understanding, procedural fluency and strategic competence. It helps to show the magnitude of distances on a line, equivalent quantities and proximity of numbers to landmark numbers (Dreambox, 2010). The open numberline provides the opportunity for children to practice efficient strategies such as jumps of ten, splitting numbers and compensation.

Different from a “regular” numberline with the counting numbers written on it, the “open” number line is a line that children draw to show/record their thinking as they solve addition and subtraction problems. It is allows them to illustrate their strategies. Students only write the numbers that they are using in the problem. They record these number as jumps along the number line.

MORE OPEN NUMBERLINE VIDEOS

http://video.google.com/videoplay?docid=3994310605104585037#

http://www.schooltube.com/video/1dfbbb1f601024240eec/Open-Number-Line-Subtraction

http://video.google.com/videoplay?docid=3994310605104585037#docid=-3426259241236279807

http://mrsdelgado.edublogs.org/2010/10/26/open-number-line-subtraction/

Read this Vignette of a Small Guided Math Group in Action:

Building Strategic Competence with the open numberline

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