Welcome to **GridMaths.com**!

GridMaths is Grid Paper for your screen, with some really nice extras that make it ideal for exploring Math:

Handy for worked Math problems where you need to line up the columns.

Helps you focus on the concepts when doing long division and multiplication.

GridMaths is Grid Paper for your screen, with some really nice extras that make it ideal for exploring Math:

- type in any square
- lines, boxes & ellipses
- counting beans
- quisenaire rods
- worked problems
- step thru edit history
- save the trees
- more coming soon

Handy for worked Math problems where you need to line up the columns.

Helps you focus on the concepts when doing long division and multiplication.

Tap or click on a square to type there

Type with keys and use arrow keys to move around

pops up the Numeric tap keypad

for lines, boxes and ellipses

goes back to normal text and number entry

Quisinaire Rods and Beans tap pad

choose current Color, Line and Opacity

navigate thru your edits

destroys the preceeding edit

to view other Sheets

adds a new Grid Sheet

Suppose `ax^2+b x+c=0` and `a!=0`.

We first divide by `a` to get `x^2+b/a x+c/a=0`.

Then we complete the square and obtain `x^2+b/a x+(b/(2a))^2-(b/(2a))^2+c/a=0`.

The first three terms factor to give `(x+b/(2a))^2=(b^2)/(4a^2)-c/a`.

Now we take square roots on both sides and get `x+b/(2a)=+-sqrt((b^2)/(4a^2)-c/a)`.

Finally we subtract `b/(2a)` from both sides and simplify :

`x_(1,2)=(-b+-sqrt((b^2 - 4ac)))/(2a)`