Video help files: example addition subtraction multiplication #division# parenthesis signed parenthesis creating numbers strategies
Static Help: 23-15 274+162 25-18 12*12 324/18 (5+2)*3 -(5-10) 9998 => 9998+2-2 98*98
Download page direct download
Animated help files: Example: 324/18

Double click to explode or to regroup 10 by 10.
Drag the mouse pressing left button to build a parenthesis window.
Double click in the window to erase the parenthesis.

© 2010 Maurici Carbó Jordi of
Video help built and converted to swf with: CamStudio: