Math Sum is a number puzzle for practicing mental arithmetic. The goal of the game is to add the numbers in each row and column so that their sum is equal to the numbers in the capitals and rows. Test your math skills and logic with Math Sum!

Each row and column contains numbers whose sum is equal to a given number, and all these sums must fit the solution. You need to choose the correct numbers and erase the wrong ones. Remember that the sums of the numbers in the rows and columns must be equal to the numbers outside the playing field. Each level of this game has only one solution, try to find it to solve the number puzzles!

Mental arithmetic is useful for developing your brain and improving math in your life. Math Sum has different difficulty levels. Playing number games and solving math problems can improve your arithmetic skills.

How to play Number Sums:
- Choose the correct numbers that add up to the values indicated on the left and top of the rows and columns.
- Use the switch to change between tracing and erasing modes.
- Each level of these math puzzles has only one possible solution.
- Train your math skills with this free puzzle game.

Tips for improving your skills:
- Erase numbers on the playing field that are greater than the amounts in the cells.
- If there is only one odd number in a column or row, and the sum in the cell outside the field is an even number, then remove the odd number.
- If the largest number on the board does not match the key total outside the board, then add the smallest number to it. If the sum is greater than the value in the cell, then erase the largest number.

What do you get by playing Math Sum:
- An endless number of number puzzles to train your mind.
- Minimalistic design.
- Useful hints to help you if you get stuck.
- Puzzles without time limits. Take your time and find the only possible solution to these number games.