Abacus Math Program – Lesson 4 – Simple Multidigit Addition and Subtraction
With the basic abacus movements learned in the first 3 lessons on a single rod, we are now ready to apply our knowledge to more than 1 rod. If you have not looked at the first 3 lessons or are new to abacus math, I suggest you take a look at Lesson 1, Lesson 2, and Lesson 3 first which