Monday, December 1, 2014

Websites of the Week! Celebrating the Rekenrek and the Protractor 11/28

Interactive Rekenrek (Math Rack) 

Rekenrek is a math rack (similar to an abacas) that is used to develop number sense by allowing students to make visual images of numbers.

Here are some interactive versions of the Rekenrek that can be used with interactive whiteboards or for student workstations using computers:

http://www.ictgames.com/brilliant_beadstring_with_colour.html

http://www.mathlearningcenter.org/web-apps/number-rack/

http://www.ronblond.com/MathGlossary/Division01/Rekenrek/REKENREK/index.html
(requires Java)


Interactive Protractors 

4th Grade math will be using protractors during the 3rd Nine Weeks (specifically Bundle 8).
  • 4.7A Illustrate the measure of an angle as the part of a circle whose center is at the vertex of the angle that is "cut out" by the rays of the angle. Angle measures are limited to whole numbers. 
  • 4.7B Illustrate degrees as the units used to measure an angle, where 1 / 360 of any circle is one degree and an angle that "cuts" n / 360 out of any circle whose center is at the angle's vertex has a measure of n degrees. Angle measures are limited to whole numbers. 
  • 4.7C Determine the approximate measures of angles in degrees to the nearest whole number using a protractor. 
  • 4.7D Draw an angle with a given measure. 

Interactive Protractors for use with whiteboards or at student computer stations:
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