Here are FOUR! free apps that require students to use strip diagrams (bar models) to solve problems. Each app has a different focus, addition, fractions, ratios, or multiplication. These are also available on the Math Playground Website.
Your students might need some coaching on how to use a bar diagram. strip diagrams are a helpful way to see the relationship between quantities. I wish that I had bee shown how to use strip diagrams in school. Especially for ratios.
Each app has different levels that get progressively more difficult and use different types of situations.
The students are given feedback as they place each part of the strip diagram. If they get it wrong at first, they are prompted with question to think about to help them.
Not every student loves this app, but it is helpful for them to practice making bar diagrams to model situations.