Check this out!!
Reviewed by a teacher who uses it:
What it is: I love tangram puzzles, so when I found Tangram House I was thrilled. This online version of the Chinese puzzle lets students select a puzzle to complete and work with 7 tans (shapes) to fill the puzzle. The tans can be rotated, flipped, and dragged into place. The puzzles can be completed online or downloaded for free as an offline game.
How to integrate Tangram House into the classroom: The format of this website would be appropriate for an interactive whiteboard activity. Split students into teams that will take turns at the board forming the tangrams. Encourage the students who are not at the board to help out with good directions and clues for the student working on the puzzle. This is a good way for kids to practice giving and receiving quality instructions and descriptions. Tangram House could also be used on classroom computers as a math learning center or individually in a computer lab setting. Tips: Play online or download for free and play offline.