Algebra tiles have
a variety of other names: algetiles, math tiles, and
virtual tiles. Algebra tiles can help you visualize
equivalent algebraic expressions and/or equations.
Many of the real tiles have a positive and a negative
side. The virtual algebra tiles activities will use
multi-coloured positive tiles. The reverse (negative)
side of each of these tiles is red. It helps to understand
that negative tiles have one positive and one negative
dimension.

Some algebra kits
use black tiles for positive areas and red for the flip
(negative) sides. Click the "Black/Red Tiles"
button for additional information.