The following link will lead you to an online book.
This book contains some ways by which your calculations will become faster.
eg. find the square, cube roots, multiplication, division, etc.
Within no time you can solve problems orally, which otherwise requires several minutes.
Back to Community Shelf
4 Nickels awarded!![[Post New]](/templates/default/images/icon_minipost_new.gif){kind=icon}
54
