Actually, the calculation was so simple that I was surprised that he didn't simply do it in his head...
Anyway, it turns out that just as there is a "Way of Tea" and a "Way of Archery" and so on, there is also a venerable "Way of the Abacus" and you can go to evening classes and study how to master it. In short, I had stumbled upon another facet of "traditional Japan".

Tomoe 11-Rod Pocket Soroban
$22.50 plus S&H
Click here for photo.
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Tomoe 11-Rod Soroban
This Tomoe model is a pocket-sized Japanese abacus which consists of eleven rods each with four beads below and one above the divider.
The rods are housed in a sturdy plastic frame that measures 6.5 x 2.5 inches. The beads are made of plastic and are mounted on wooden rods.
This soroban is sufficient for everyday calculations (you sometimes see it being used in shops and post offices etc).
Shipping: Express Mail Service from Japan.
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Tomoe 11-Rod Multi-Colour Soroban
$22.50 plus S&H
Click here for photo.
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Tomoe 11-Rod Multi-Colour Soroban
Here's a Japanese abacus with a difference! Brighten up your calculations with this multi-colour soroban.
The abacus consists of eleven rods each with four beads below and one above the divider, but each row is made up of beads of one colour, with the whole abacus consisting of beads of five different colours: yellow; orange; green; red; blue; cream.
The rods are housed in a sturdy plastic frame that measures 6.5 x 2.5 inches. The beads are made of plastic and are mounted on wooden rods.
This soroban is sufficient for everyday calculations.
Shipping: Express Mail Service from Japan.
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Tomoe 13 Rod Plastic Soroban
$28.50 plus S&H
Click here for photo.
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Tomoe 13-Rod Plastic Soroban
This Tomoe model is a standard-sized Japanese abacus which consists of thirteen rods each with four beads below and one above the divider.
It is made of plastic. It is well finished and offers a functional and economical alternative to the standard wooden model listed below It measures 7.8 x 2.5 inches.
Shipping: Express Mail Service from Japan.
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Tomoe 13 Rod Wooden Frame Soroban
$45.00 plus S&H
Click here for photo.
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Tomoe 13-Rod Wooden Frame Soroban
This Tomoe model is a standard-sized Japanese abacus which consists of thirteen rods each with four beads below and one above the divider.
The frame is made of wood and is a very traditional soroban. Fine wood and a good quality, it measures 7.8 x 2.5 inches.
Shipping: Express Mail Service from Japan.
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Tomoe 15 Rod PatiQ Soroban
$35.00 plus S&H
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Tomoe PatiQ 15-Rod Soroban
This PatiQ soroban is made of plastic and comes in a pretty, robust case. The top label says that "Practice makes Perfect".
It measures 9.4" x 2.6".
Shipping: Express Mail Service from Japan.
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Tomoe 23-Rod Soroban
$52.00 plus S&H
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Tomoe 23-Rod Soroban
This is Tomoe's standard 23-rod soroban and is finely crafted in plastic and wood.
The frame is strengthened at back by a series of pins.

Shipping: Express Mail Service from Japan.
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Tomoe 27-Rod Soroban
$58.50 plus S&H
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Tomoe 27-Rod Soroban
This is Tomoe's standard 27-rod soroban and is finely crafted in plastic and wood.
The frame is strengthened at back by a series of pins.

Shipping: Express Mail Service from Japan.
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