Abacus Math Program – Lesson 8 – Ten Pair Complement Subtraction Part 2
Continuing from Lesson 7 Subtraction Part 1 we will look at a few more 10 pair complement subtraction examples. Again there are 5 possible 10 pair complements: 9-1, 8-2, 7-3, 6-4, 5-5. All of these pairs are reversible meaning we can use the complement pair, 9-1, for both the problem 10-1 just as we can use the same pair
Abacus Math Program – Lesson 7 – Ten Pair Complement Subtraction Part 1
In Lesson 5 and Lesson 6 we introduced the idea of 10 pair complement addition on the abacus. Here in Lesson 7 we will introduce the concept of subtraction with 10 pair complements. In review, there are only 5 possible 10 pair complements: 9-1, 8-2, 7-3, 6-4, 5-5. In the case where we want to subtract a number from a
Abacus Math Program – Lesson 6 – Ten Pair Complement Addition Part 2
Continuing from Lesson 5, we will look at a few more 10 pair complement addition examples. Again there are 5 possible 10 pair complements: 9-1, 8-2, 7-3, 6-4, 5-5. All of these pairs can be used in two ways. For example we can use the pair 9-1 where we are trying to add 9 by subtracting the complement 1. But
Abacus Math Program – Lesson 5 – Ten Pair Complement Addition
In lesson 5, we will introduce the concept of 10 pair complements or 10 pairs. If you are new to abacus math, we suggest that you start from lesson 1. This abacus math lesson will use the 10 pair complement method for addition but as we will see in a later lesson the 10 pair complements are also
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