the "teach" mode: here you learn at your
own pace by entering your own
calculation like "
A+
B", "
A-
B", "
A*
B",
or "
A/
B" (where
A>0 and result
positive). Pressing the enter key, will give you a step by step explanation and
show proper moves on the abacus. According to the books below, you are supposed
to start on left side, when adding or subtracting
multi-digit numbers. (There is a menu option "rightToLeftAdd", if you think
this is inefficient (similar one for multiplication "rightToLeftMult")).
Lee's Abacus is more suitable if you are learning multiplication and division,
as there are extra places to store operands.
SQRT operation is a feature that that solves perfect squares
(0 - 104080804 tested with internal tester) in teach mode and also
handles floating point numbers. For non-perfect squares it gives
approximations. Move the decimal point slider to the left before
starting to increase precision. Try it out with "10201v" in
teach mode on a "Lee's Abacus". Unlike the other operations,
sqrt reduces to an answer from which you must divide by 2. (You
can try that out like "202/2", once sqrt operation gives you its
"doubled" answer). This follows closely the work of Lee Kai-chen
from his book "How to Learn Lee's Abacus". Let me know of
any problems. Now if you can just input negatives... the solution
would involve turing the abacus sideways. ;)
CBRT operation is a brand
feature that was just added. It solves perfect cubes
(0 - 1003003001 tested with internal tester). Try it out with
"1030301u" in
teach mode on a "Lee's Abacus". Here cbrt
reduces to an answer from which you must divide by 3. (You can
try that out like "303/3", once cbrt operation gives its "tripled"
answer.) This again follows closely the work of Lee Kai-chen.