by adding
abacus
Abacus
You can use an abacus to add and subtract quantities of beads by moving the them around. This can in turn help to solve equations involving counting numbers.
Abacus
An abacus counting board.
The abacus was originally used to add and subtract. It was much faster than an adding machine. Its weakness was that it did not leave a paper trail.
The abacus is considered the first adding machine because it was the first tool that was used to add with. There were not any counting devices until the invention of the abacus in 3000 BC.
Calculator Fingers Abacus Pencil and paper
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Abacus software specializes in creating computer books for the general audience. They also specialize in developing add-ons for flight and train simulations.
abacus
The upper part of an abacus consists of one bead each that has the value of 'five'. The lower part of an abacus consists of four beads and each of them has value 'one'. All the beads in one grid together add up to the value 'nine'.