Math games not only teach, develop, but also entertain. You study and play at the same time, not noticing how knowledge fills your head by itself and settles there. To be useful at the right time. To play Sum Lines, you will need not only pure mathematics, the ability to solve problems, but also quick wits. You must place numbers on the blue line to get the desired amount. Drag colored balls with numerical values to form an example on the line, the result of which will be the initially given number. That is, instead of looking for the answer to the problem, you must compose the problem itself in Sum Lines.