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Derrick Coetzee's photostream
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Me subtracting 123456789 from 246913578 in left-to-right order - Step 6
I'm now subtracting 4 in the 4th position from the left. I simply subtract 4. CC0 waiver: To the extent...
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Uploaded on Jan 27, 2012
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Me subtracting 123456789 from 246913578 in left-to-right order - Step 5
I'm now subtracting 3 in the 3rd position from the left. This is done in 2 steps: subtract 5, add 2. In...
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Uploaded on Jan 27, 2012
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Me subtracting 123456789 from 246913578 in left-to-right order - Step 4
I'm now subtracting 3 in the 3rd position from the left. This is done in 2 steps: subtract 5, add 2. In...
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Uploaded on Jan 27, 2012
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Me subtracting 123456789 from 246913578 in left-to-right order - Step 3
This step subtracts 2 from the 2nd column from the left. I simply subtract 2. CC0 waiver: To the extent...
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Uploaded on Jan 27, 2012
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Me subtracting 123456789 from 246913578 in left-to-right order - Step 2
In this exercise I'm showing how to compute 246913578 minus 123456789 = 123456789 on the giant Soda Hall...
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Adding 123456789 to itself on abacus in left-to-right order - Step 20
I'm now adding 9 in the 9th position from the left (the rightmost position, the ones position). This is...
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Uploaded on Jan 27, 2012
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Adding 123456789 to itself on abacus in left-to-right order - Step 19
I'm now adding 9 in the 9th position from the left (the rightmost position, the ones position). This is...
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Uploaded on Jan 27, 2012
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Soda Hall abacus with laptop and smartphone
The abacus reads 246913578, the result of addition in the exercises. Smartphone is a Nokia E71. It has...
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Uploaded on Jan 27, 2012
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Soda Hall abacus with laptop and smartphone - closeup
Only the bottom three rods (leftmost three positions) of nine of the abacus rods are shown. They read 2,...
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Uploaded on Jan 27, 2012
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Angled view of Soda Hall abacus, looking upwards (2)
CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work.
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Uploaded on Jan 27, 2012
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Angled view of Soda Hall abacus, looking upwards (1)
CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work.
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Uploaded on Jan 27, 2012
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Closeup of two beads against crossbar on Soda Hall abacus
One upper bead, one lower bead. Symmetrical. CC0 waiver: To the extent possible under law, I waive all...
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Uploaded on Jan 27, 2012
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Closeup of bead on rod on Soda Hall abacus
CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work.
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Uploaded on Jan 27, 2012
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Soda Hall abacus - plaque (2)
Reads: ARM & HAMMER CABINET SHOP BERKELEY, CA 1974 CC0 waiver: To the extent possible under law, I...
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Uploaded on Jan 27, 2012
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Soda Hall abacus - plaque (1)
Reads: ARM & HAMMER CABINET SHOP BERKELEY, CA 1974 CC0 waiver: To the extent possible under law, I...
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Uploaded on Jan 27, 2012
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Closeup of Soda Hall abacus (2)
Closeup of six wooden lower beads and one upper bead pushed against the crossbar, and one upper bead...
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Uploaded on Jan 27, 2012
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Closeup of Soda Hall abacus (1)
Closeup of six wooden lower beads and one upper bead pushed against the crossbar. CC0 waiver: To the...
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Uploaded on Jan 27, 2012
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Subtracting 123456789 from 246913578 in left-to-right order - Step 18
I'm now subtracting 9 in the 9th position from the left. This is done in 2 steps: subtract 10, add 1. In...
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Uploaded on Jan 27, 2012
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