How to use abacus

Material preparation: abacus, etc.

1, take a look at the abacus first. The most commonly used abacus in life has two rows of beads on different plates.

2. As long as a new calculation is started, all beads must return to the next line.

3. The upper bead represents the number 5, and each bead below represents the number 1.

4. Each column of the abacus represents a fixed number, starting from the right; The first column represents one unit, the second column represents ten, the third column represents one hundred, and so on.

5. When calculating, if it is one, dial a bead from the bottom, if it is two, dial two beads, if it is five, dial a bead in the top column, and so do the numbers after 10 and 100.