Learn to use the abacus(soroban), the Japanese way - Part 2

We are doing addition and subtraction by making use of the complementary numbers. This will be continued on part 3 of the soroban series.

9:43 reasoning behind the specific order of operation

3:12 addition using complementary numbers w.r.t. 5
4:48 subtraction using complementary numbers w.r.t. 5
6:30 addition using complementary numbers w.r.t. 10
8:09 subtraction using complementary numbers w.r.t. 10

The video is created with Theorem of Beethoven's version of Manim.

Creator of Manim.

Hand model from Amin's tutorial.

Thank you to everyone above who have shared their knowledge and software to the whole world.
Background music played on a Casio digital piano.