This app has numerous really good teaching strategies incorporated into it.

There are a variety of levels of equations to solve. The problem is presented as a beam balance with a combination of pawns and numbers on both sides. It is necessary to find the value of the pawn. The player then has to substitute their answer into both sides of the equation to check they are correct. It is then possible to get the app to auto check the equation which it does by giving a value to each pawn and number and totalling both sides of the equation.

Level 1 of the free version has 10 questions and there are 6 levels and a review.

There is also a paid version.

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