how do you count on an abacus ?

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How do you count on an abacus?
0:281:20Abakus EuropeYouTube·May 20, 2023How to count on abacus? Part 2YouTube·Abakus Europe·May 20, 2023YouTubeIn this video"...We use the index finger. And the thumb simultaneously. For adding numbers on the Abacus. We need to move the beads to the beam. And for subtracting...."From 0:28We use the index finger. And the thumb simultaneously. For adding numbers on the Abacus. We need toMoreWe use the index finger. And the thumb simultaneously. For adding numbers on the Abacus. We need to move the beads to the beam. And for subtracting.
 
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