This is a famous way of learning in Japan when little school’s children master Arithmetic.
In addition we added some artistic factor for the cultivation of aesthetic sensitivity of children.
Of course we think that matured people can enjoy this app as one of your brain gym tools.

Users can choose the number of cells from ‘6 by 6’, ‘8 by 8’ and ‘10 by 10’.

On the left side of the user’s input cells,
there is a series of cells that specifies the values of rows.
On the upside of the user’s input cells,
there is a series of cells that specifies the values of columns.

If the value of one of row cells is 1, the value of one of column cells is 2,
And if a user select the type of calculation as ‘addition’,
the user can input the value of 2 as the answer of the input cell on which
the row cell and the column cell intersects.

If you have children of age of elementary school, we want your children to master
arithmetic with enjoyment with you, communicating with each other, using this app,
when you make ten or twenty minutes of time for your children.