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Abacus is known to be the most ancient calculating device. It has been endured over the times but still used in some of the countries of the world. The entire abacus consists of the wooden frame, rod and the beads. The device was also used for the small children to teach them the basic rule of addition and subtraction.
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Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.