The Abacus this is about abascius the firs t.pptx

2.  What is an Abacus?
 History of Abacus
 How to use an Abacus
 Advantages of Abacus at that times
 Advantages of Abacus Now a times
 Disadvantages of Abacus
 Abacus unforgettable

3.  An Abacus is the first counting machine.
 That was in use centuries before when the
numeral system was not introduced and It is
still used in different purposes.
 It is made of a wooden frame, metal rods,
and wooden beads.

4.  The Abacus may have been invented in
China in fourth hundred b.c.
 Abacus come from the Greek word “ABAX”,
which means calculating table.

6.  Made counting easy and faster.
 Made easy to remember.
 Help them to done basic arithmetic operation
like addition , subtraction , multiplication and
division.

7.  Helps kids learn basic number systems.
 It helps blind children's in their Airthematic
studies.
 Chinese and Japanese are still using abacus
as an counting machine.

8.  Unlike a calculator it can only be used for
Addition subtraction, division and
multiplication.
 Because counters are manually moved, its
hard to tell if you make a mistake.