How to use the abacus, how to use the abacus?

1. First of all, from right to left, the abacus is one, ten, hundred, thousand and ten thousand.

There are two beads on the abacus and five beads below.

3, five on a bead, ten on a bead; For example, if you add 25 to 17, you will first hit 25 on the abacus, then add 7 on the abacus to become 32, and then add 10 to become 42.

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