A simple type of abacus to help with counting up to one hundred. Can be used for adding, subtracting and other sums. This program is a very basic counting frame using beads to help in adding up or take away. Each bead represents one unit. They are different colours only to make it look a little more interesting, they are all the same value i.e. 1. There are 10 rows of 10 beads, making 100 in all. Using the mouse pointer to click on each bead at the end of a row will make that bead move to the left of the frame and add 1 to the total below the frame. Clicking on that same bead when it is over to the left will move it back to the right and take away (subtract) 1 from the total. If you click a bead in the middle of a row, that bead and all the ones to left of it will move across to the left and the total number of those beads will be added. Similarly if you click on a middle bead of a row on the left of the frame, these will be taken away. There is a small tally (total) of each row kept just to the left on the frame woodwork.
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