Jump to content

Using an Abacus/Subtraction

From Wikibooks, open books for an open world

Subtraction

[edit | edit source]

Subtraction is the second most basic function of the abacus. The subract, the user displays the original number and takes away the desired amount of beads from the original number.

Example: (12-4)

12=12
000-0|-0  (1)
00-00|-0  (2)

12-4=8
0000-|-0  (0)
0-000|0-  (8)
[edit | edit source]