411 REFERENCE · Wikibooks
Using an Abacus/Addition
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Addition
Addition is thought to be the easiest function the abacus can calculate. To add, the user must display the original number and add the desired number of beads to the original number.
Example: (6+5)
6=6
0000-|-0 (0)
000-0|0- (6)
6+5=11
000-0|-0 (1)
000-0|-0 (1)
External links
Addition on a Japanese abacus selected from Abacus: Mystery of the Bead