https://itunes.apple.com/us/app/thinking-blocks-addition/id668450919?mt=8

About:

Thinking Blocks Addition teaches children how to model and solve word problems involving addition and subtraction.

For Education:

Thinking Blocks Addition may be paired with any elementary math program. It is ideal for students learning model drawing strategies.

Breaking Barriers:

The models help students compartmentalize and organize information and visualize number relationships.

Age Restrictions:

Thinking Blocks Addition is best suited for children, ages 6 to 9.

 Source: Math Plaground (2013).