Mental arithmetic. Addition and subtraction on the soroban
English | 54m | Video 720p | Subtitles
The first block of the course on mental arithmetic for teachers.
What you'll learn Introduction to mental arithmetic. Introduction to soroban. Addition and subtraction on the soroban Direct invoice without formulas Solving examples with formulas of junior fellows, senior fellows, and compound formulas The solution of examples with multi-digit numbers. Mental score. Homepage: https://www.udemy.com/course/mental-arithmetic-addition-and-subtraction-on-the-soroban/ 
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