The PhET Team Released Four new HTML5 sims for Math in the Area Model Suite

The New Area Model sims are: 

(1.) Area Model Introduction is an approachable introduction to the concept of multiplication as area. Students can develop a strategy that uses an area model to simplify a multiplication problem.

(2.) Area Model Decimals allows students to apply their previous understandings of multiplication using an area model to multiply of rational numbers.

(3.) Area Model Multiplication extends the area model to multi-digit numbers. Students can explore the product of multi-digit numbers on a proportional grid and progress to using a generic model.

(4.) Area Model Algebra includes an additional Variables screen that allows students to multiply polynomial expressions, and a game screen to test their multiplication and factoring skills.

[Link] to Math Sims