For a change from modern calculators, here's a tiny but fully functional abacus for your Treo.

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Instructions

How to use the abacus:

• Tap the bead that you want to move. The bottom 5 beads each hold a value of one. The top 2 beads each hold a value of 5. These values are multiplied by 10 per column to the left of the first. Once you have a value greater than 10 in a column, the abacus automatically rounds the value to the column to the left.
• If you would like to account for decimals, use the page-up/down hard button. This moves the decimal bar.
• You can copy the value into the clipboard from the "Ftns" menu or c-shortcut.
• You can change the color of the bead or bars from the "Prefs" menu.