RekenrekTool

|| This information has been updated for version 1.3.0, released November 2017. Examples Features of the Tool PDFSupports How-To Videos
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**Rekenreks** are arithmetic racks used to build understanding of whole numbers, number relationships and reasoning for various operations. Each rod has ten beads, five of one colour followed by five of another colour.

Take a screenshot of your work to share with your teacher or add to a portfolio.

You can access a wide variety of Annotation tools using the button to communicate your thinking.

You can insert pictures into theTool using the button.



Examples

 * [[image:Rekenrek_Seven.png width="320" height="210"]] || ==Representing==

Represent numbers by sliding the beads to the left.

This shows the number 7.

Five red beads followed by two white beads helps us to see that 7 is equal to 5 + 2. ||
 * [[image:Rekenrek_Representations of 7.PNG width="320" height="168"]] || ==Connecting Representations==

Create alternate representations using the newest annotation objects (November 2017).

Colour can be used to make connections between representations. ||
 * [[image:Rekenrek_SevenPlusEight.png width="320" height="208"]] || ==Addition and Subtraction==

Slide 8 beads to the left on the second row.

This now shows 7 + 8 = 15.

Alternatively, ten red beads and five white beads help us to see that 15 is equal to 10 +5.

Or, if we think about the white beads on the right hand side, we can think of 15 as equal to 20 - 5. ||
 * [[image:Rekenrek_Fifteen_with_Shade.png width="320" height="203"]] || Use the shade to think about 15 + ? = 20. ||
 * [[image:Rekenrek_MoreRows.png width="320" height="206"]] || Click on the + sign to increase the number of rows of beads. ||
 * [[image:Rekenrek_FourTimesSeven.png width="320" height="208"]] || ==Multiplication==

This represents 4 rows of 7 or 4 x 7.

There are 28 beads in total, so we know that 4 x 7 = 28. ||
 * [[image:Rekenrek_DecomposedProduct.png width="320" height="205"]] || If we look only at the red beads, we see 4 groups of 5.

The white beads show 4 groups of 2.

So, the colours help us to see that 4 x 7 = 4 x 5 + 4 x 2. || It might be helpful to import a screencast of the question you are working on.
 * [[image:Rekenrek_CookieSolution.png width="357" height="260"]] || ==Image Import==

The rekenrek provides a powerful visual representation that could be used to support a variety of multiplication strategies.

How might you use this representation to support reasoning related to:
 * counting
 * halving then doubling (8 x 9 is 4 x 9 doubled)
 * decomposing 9 (8 x 9 is 8 x 5 plus 8 x 4)
 * using an anchor of 10 (8 x 9 is 8 x 10 minus 8 x 1)
 * another approach? ||
 * [[image:Rekenrek_Annotation Mode.png width="353" height="297"]] || ==Annotation Mode==

Press the pencil icon at the top of the screen to enter annotation mode.

Make notes to explain your thinking. ||
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Features of the Tool
Add one or two shades to the stage. Shades can be used to hide part of the representation. || Hide/Show a wide variety of Annotation Tools which can be used to communicate your thinking. || You can insert images into the tool. More details. || Delete all your work and return the tool to its starting state. || Access a link to this wiki, a How-to video, a feedback form as well as copyright details and version number. || Use this mode to adjust the bead and background colours as well as hide, delete or move rows. The tool is also completely functional in this mode. ||
 * [[image:Rekenrek_PlusButton.png]] || ===Add a Row=== ||
 * [[image:Rekenrek_ShadeButton.png]] || ===Show Shade===
 * [[image:Rekenrek_PencilButton.png]] || ===Annotation Tool===
 * [[image:Rekenrek_ImageButton.png]] || ===Insert Image Button===
 * [[image:Rekenrek_ResetButton.png]] || ===Reset===
 * [[image:Rekenrek_InfoButton.png]] || ===Information===
 * [[image:Rekenrek_SettingsButton.png]] || ===Settings===
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PDF Supports
mathies Rekenrek Learning Tool Tip Sheet

Rekenrek Tip Sheet (Source: EduGAINS /Ministry Developed Resources/ Mathematics / Classroom Practices/Technology and Teaching Tools/Manipulative Use)
 * What are Rekenreks?
 * How do Rekenreks help students?
 * Sample Activities
 * Recommended Websites

Visit EDUGAINS for additional Tip Sheets.




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How - To Videos
Videos are provided in two formats to allow for use on a greater variety of browsers and devices. To be among the first to find out about latest digital tool developments, sign up for our email list at http://mathclips.ca/WhatsNewEmailList.html. @ONmathies on Twitter
 * **Exploring the Basic Functionality** ||
 * media type="custom" key="25749324" width="97" height="97" ||
 * Video Transcript ||
 * **Not working?** Try mp4 format ||


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