-
Used to count and tally items
-
A tool used for counting. Made with wooden poles and small round beads.
-
A more primitive version of the mechanical calculator
-
It was the first device to be able to preform addition, subtraction, division and multiplication on its own.
-
The first adding machine, was not made avaible to the public til 1951
-
This was a big break through in calculators, on that we still use today.
-
Another mechanical calculator, it declined in use when people began the process of inventing the digital calculator
-
The first calculators were large machines, and not very portable, unlike our calculators.
-
Our calculators today are small, portable, and can preform many mathematical operations. Some can even graph.
