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 * [[image:mathclips/rekenrekButton.png caption="Click button to open Rekenrek Tool in new window." link="@http://oame.on.ca/CLIPS/swfPlayer.html?swfURL=tools/ubRekenrekCreator.swf"]] || Make me some space || ==Home | MathCLIPS Tools | Rekenrek Tool==

How-To Videos | PDFSupports ||

**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.


 * [[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_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. ||
 * [[image:Rekenrek_Settings.png width="320" height="206"]] || ==Settings==

Press "settings" to change the colours, hide a row or delete a row. ||

How - To Videos
Video supports are currently in development and will be posted here when complete.

PDF Supports
Rekenrek Tip Sheet (Source: EDUGAINS/Math/Learning Materials/Manipulatives Supports/ Manipulatives Tip Sheets)
 * What are Rekenreks?
 * How do Rekenreks help students?
 * Sample Activities
 * Recommended Websites

Visit EDUGAINS for additional Tip Sheets.