Calculus Plus

Calculus Plus is a free interactive Game. You will see the grids of numbers. There are some objective circles around them. The grid boxes are shown in the grey colour and objective circles in green colour.
Now you have to do the addition of numbers. The sum of numbers in each row or columns must be equal to the number in the objective circle. objective circles are showing the required sum of highlighted row and column. Similarly, you have to make the sum of rows and column equals to their respective objective circle.
You have to select the grid boxes which you want to subtract from their respective row and column. To do so you have to tap on that grid box. As you see the selected grid box become unchecked. When a sum of row or column became equals to the number in an objective circle, the colour of number in objective circle changed from red to green as shown in below image.
Your target is to make the addition of all the columns and rows to their respective number in objective circles. When you complete each game successfully you will get 100 points in your score. Make highscore and enjoy the game.