How does the abacus function?

Answer 1

An Abacus is a device to help do math.It is basically a frame with rods and beads in the rods.One rod will represent ones,the next tens, then hundreds,then thousands.You move the beads up when you want to add and down when you want to subtract.

Answer 2

An Abacus is kind of like an old fashioned calculator that is used to add and subtract. (There Is an Image). There are at least 100 beads. If I wanted to do 100 - 7, I would move 7 beads over to the other side. Leaving me with 93.