New: Touch decimals:
free Android app: Part II
Main components of
Touch Decimals:
The main board with
two charts of identic number of inner rectangles.
Each chart with:
A number with dot
that represents each one of the two numbers.
A button to change
the sign of all the inner components of each chart.
A row of a variable
number of rectangles named: “Places”
A variable number of
big dots (with numbers inside), named: “Tokens”.
In the “settings”
button or option button: the way to refresh the charts.
PLACES:
A place is a
rectangle, and a rectangle has 4 borders:
The top and bottom
border may limit another equivalent place, or an abyss where can fall
tokens, and become lost forever.
A token is free to
cross any of those boundaries under its responsibility.
The left border is
impenetrable:
Only it is
authorized by the passage of a token if it gets the support of 10
tokens of the same type.
When the 10 tokens
have crossed the left border, become one token
The right border:
Right border can be
crossed freely
If a token cross the
right boundary, it becomes 10 tokens of the same type in the next
place.
The maximum
reccomended number of tokens into each place is: nine.
TOKENS:
A token can be
either positive or negative
A positive token is
born with the tap of a finger on the screen
A pair of
positive-negative tokens is born with a tap of two fingers on the
screen
A token disappears
if it crosses the top or bottom border.
Positive and
negative tokens have the same behavior:
A token can cross at
will the intermediate horizontal border
When a token crosses
the border on the right, it becomes 10 tokens.
A token need 9
companions from the old place to cross the border to the left.
Positive and
negative tokens may be in the same place.
But if two tokens of
different signs meet, they cancel each other.
Touch decimals,Place
value ±
This is how the
tokens live in their places in "Touch decimals, Place value ±"
The behavior of
places and tokens of this app describes the behavior of the numbers
in the decimal system.
Development:
All in this text: charts (twins), places and tokens also describes the internal structure of the app and his internal java classes:
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