Welcome to abacus tutorial.
Abacus or soroban is a calculating device,
used to do basic calculations such as addition,
subtraction, multiplication and division in
a simple, fast and easy way.
This is a software version of abacus.
In this video I am going to show how the number
representation is done in abacus.
Abacus is a mechanical calculating device.
The structure of abacus is as in the image.
A frame, beams and beads.
One set of beads on the top row.
And four each at the bottom one.
The beads at the bottom is called earth beads.
Heaven beads are the ones on the 
top row.
Value for each heaven bead is five.
And the value for each earth bead is one.
The right most beam is for representing units,
the next one for tens, hundreds and so on.
Set and reset mode.
Heaven bead is 
set when is moved down, and reset when it
is moved up.
Earth
bead is set when is moved up, and reset when
it 
is moved down.
set five
set six
set
seven
clear
eight
nine
maximum single digit representation
 two digit numbers, that 
is from 10 to 99
ten
 twenty
thirty
 ninety
7:52 eleven
8:08 nineteen
08:30 Sixty three
08:45 hundred
09:00 Four hundred
09:03 five hundred
09:16 five hundred
and thirty
09:33 five hundred and thirty eight
9:50 thousend
10:03 Ten
thousand
10:12 hundred thousand
10:23 hundred thousand and five
10:50 hundred thousand and fourty five
11:00 hundred thousand three forty
five
11:20 five hundred [move heaven bead down]
This is the way to represent numbers in an
abacus.
Earth beads have value one and the heaven
beads value us five.
Move heaven bead down to set and move earth
bead up to set.
Move heaven bead up to reset and move earth
bead down to reset.
