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Place Value Mat
Author:
John Golden
LearnZillion activity for investigating the relationship of place value to addition and subtraction.
GeoGebra
Based on a Duane Habecker applet.
New Resources
Constructing the Perpendicular Line Through a Point Not on the Line
Constructing the Perpendicular Line Through a Point on the Line
derivatives of x^n
探究長方形對角線上的正方形數目
Example of using color palette
Discover Resources
Circumcenter/Circumscribing a circle about a triangle
Derivative of e^x
triangle with mid segment
Discover Topics
Plane Figures or Shapes
Quadrilaterals
Kite
Multiplication
Hyperbola