This image was acquired from
flickr and flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
abacus beads addition add sum computation indoor photo border abacus beads add sum computation indoor photo border I'm now adding in the th position from the left the rightmost position the ones position. This is done in steps add subtract . In this step subtract . This completes the computation. The final result of the computation