MakeFoumula app for iPhone and iPad

It is a number quiz that will be a brain training.
It is a game-like application that uses four numbers, the arithmetic calculator (+ - × ÷), and brackets to create a target number.
Anyone with basic math knowledge can enjoy this game.
There are over 1000 quizzes, so please enjoy them at your own pace.

The rules are simple.
Change the order of the four given numbers, choose the four arithmetic units, add and remove brackets to compose the formula, and make sure the answer is the target value.
The calculation result of the formula is always displayed as the current value, so please aim for the target value while referring to it.

It is easy to operate.
The number or the arithmetic operator of the pressed button is entered at the position of the cursor in the formula.
The cursor position can be changed by moving the left and right arrow buttons or by touching the position of the formula.
You can also drag and drop numbers on the formula to replace them.

If you cant solve it, you can get a hint with HELP.
For a brain training, for education, and for killing time, please try to clear all the quizzes.