Geometry

Find the Other Half
http://www.harcourtschool.com/activity/con_math/g03c21.html

Naming Faces
http://www.harcourtschool.com/activity/elab2002/grade_3/019.html

Tangram Puzzler
http://www.tangram.i-p.com/

Shapes and Patterns
http://www.fossweb.com/modules3-6/IdeasandInventions/activities/shapesandcolors.html

Tesselation Town
http://www.mathcats.com/explore/tessellations/tesspeople.htm
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Polygons and Perimeter Visual Tutorial
http://www.tv411.org/lessons/cfm/math.cfm?str=math&num=17&act=1

Line Symmetry
http://www.adrianbruce.com/Symmetry/

Sagwa Tangrams
http://pbskids.org/sagwa/games/tangrams/index.html

Math Cats Architecture Blocks
http://www.mathcats.com/explore/obbl/obbl.html

Symmetry
http://www.harcourtschool.com/activity/elab2002/grade_3/021.html

Tangrams
http://matti.usu.edu/nlvm/nav/frames_asid_112_g_2_t_4.html?open=activities

Online Geoboard
http://matti.usu.edu/nlvm/nav/frames_asid_282_g_3_t_3.html