MathFourOps app for iPhone and iPad

The 4 arithmetic operations: +, -, *, /, are used very often in our daily lives. In many places, machines do the calculations for us and people forget how important it is to master the operations ourselves. Machines might not make mistakes but humans do. For example, if a shop forgets to update the sale price, you might pay the higher price without noticing unless you have mastered the 4 arithmetic operations.

MathForOps is a game to practice these four arithmetic operations. It has 4 fun and challenging levels.

Beginner: work with two expressions, each involving four numbers.
Intermediate: work with three expressions, each involving four numbers.
Advanced: work with four expressions, each involving four numbers.
Challenge: work with six expressions, each involving four numbers.

All numbers are between 2 and 9 inclusive. The player can adjust the complexity of the expressions as follows:

1. The player can choose if parentheses are involved.
2. The player can play with any one of the following combinations of operators.
2.1. Only practice + and -
2.2. Practice +, -, and *
2.3. Work with all four operators: +, -, *, and /

The object of the game is to swap the numbers to make the expressions equal to the target results. The player needs to do some logic analysis to decide which numbers to swap.