That is just a simple transformation of algebraic expressions.
Chinese one is practical. Indian one is not. No help to Arithmetics on paper
----
In those remote, almost forgotten years, a Chinese boy added the results of Nine Nine multiply song by singing in heart . Guess what, he got 5555, the correct one. The dying one still remembers this number.
Any others here still remember the other song: Nine Nine dividing???
2 meets 1 you get 5;
2 meets 2 you get 10;
3 meets 1 you get 31;
3 meets 2 you get 62;
.......
The Chinese boy used it to do divisions too and got quicker and quacking on abacus.
The dying one miss those years. The dying one miss this life.
Chinese one is practical. Indian one is not. No help to Arithmetics on paper
----
In those remote, almost forgotten years, a Chinese boy added the results of Nine Nine multiply song by singing in heart . Guess what, he got 5555, the correct one. The dying one still remembers this number.
Any others here still remember the other song: Nine Nine dividing???
2 meets 1 you get 5;
2 meets 2 you get 10;
3 meets 1 you get 31;
3 meets 2 you get 62;
.......
The Chinese boy used it to do divisions too and got quicker and quacking on abacus.
The dying one miss those years. The dying one miss this life.