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).