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How to Use the Abacus: Subtraction


In the previous article, we looked at doing addition on the abacus (do have a read before proceeding onto this article, if you have not done so). Today we are going to have a look at learning how to subtract using the abacus.


Always remember!

Before we start adding or subtracting numbers, always set the abacus to zero. To set your abacus to zero, push all the beads away from the beam.


Just like when counting using the abacus, we need to take note of the unit values. The center of the abacus represents the units, wherein the center column represents a unit.


From the center column, when you move to your left, the units will move to tens, hundreds, thousands, and so on. And as you move to your right, the decimals will move to tenths, hundredths, thousandths, and so on.