Algebra discs

Individual discs

To move a disc around, click and drag it.

To flip a disc over, just click it.

Groups of discs

To consider a group of discs, click and drag a brown grouping box around the discs you want. Use the corner handles to adjust the size of the grouping box.

To show/hide the sum of the discs in a group, click the black circle along the top edge of the grouping box.

Flipping all discs in a group

To flip all discs in a group:

  1. click inside a grouping box to show a triangle marked with a minus sign (if the triangle isn’t already showing)
  2. click the triangle.