10,523
edits
Changes
→Clearing the abacus
=== Clearing the abacus ===
=== Clearing the abacus ===
Before you start an arithmetic operation, you need to "clear" the abacus. The upper beads should be positioned against the top of the frame and the lower beads should be positioned against the bottom of the frame. This is the default position for the abacus when you launch the activity. (Note that some of the abacuses (e.g., the schety) do not have any upper beads. In such cases, all of the beads should start in the down position.)
Before you start an arithmetic operation, you need to "clear" the abacus. The upper beads should be positioned against the top of the frame and the lower beads should be positioned against the bottom of the frame. This is the default position for the abacus when you launch the activity.
:Note that some of the abacuses (e.g., the schety) do not have any upper beads. In such cases, all of the beads should start in the down position.
:Also note that the Clear Button on the main toolbar will also clear the abacus for you.
=== Reading the abacus ===
=== Reading the abacus ===