Changes

Activities/Abacus (view source)

82 bytes added , 19:08, 3 April 2010

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File:Abacus-6.png|1 bottom bead is up and 1 top bead is down, corresponding to 6 units

File:Abacus-10.png|5 bottom beads are up and 1 top bead is down, corresponding to 10 units (time to "carry" to the left)

+

File:Abacus-10x1.png|This 10 is equivalent to...

+

File:Abacus-1x10.png|... this 10

File:Abacus-54321.png|54321

</gallery>

10,505

edits