English: Using the abacus 5th lower bead according to "Computational Methods with the Beads in a Tray" (Pánzhū Suànfǎ 盤珠算法) by Xú Xīnlǔ 徐心魯 (1573)
Part 2: subtraction
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Captions
Using the 5th lower bead in abacus subtraction
Resta con el ábaco: uso de la quinta cuenta inferior.
Soustraction avec le boulier chinois: utilisation de la cinquième boule inférieure.