How to Multiply on the Abacus with a two digit multiplier?
Let’s generalize what we did with Multiplication with Single Digit Multiplier to a multi-digit multiplier. In this case we will look at a 2 digit by 2 digit multiplication. Again we will transform multiplication problems into a series of additions using our memorized 9×9 multiplication facts as we move both multiplier digits through the multiplicand digits.
How to Multiply on the Abacus with Single Digit Multiplier?
Multiplication on the abacus is simple, fast, and efficient. The pre-requisites for learning how to multiply on the abacus are two fold. First students must know how to add on the abacus since multiplication is a series of additions. If you don’t know addition on the abacus or are new to abacus math please take
How To Add 2 and 3 Digit Numbers on an Abacus?
To add and subtract 2 and 3 digit numbers or even higher multi-digit numbers is the same as if we are working with single digit numbers. We use all the same techniques we learned in our basic skill training. We are now beginning to see the power of abacus math since although the numbers are
Abacus Math Program – Lesson 16 – Reverse Double Rod
In Lesson 11 we looked at the Forward Double Rod movement for addition problems. Now let’s take a look at the Reverse Double Rod movement for subtraction. The double rod movement for subtraction is exactly the same as for addition with the only difference using the 10 pair subtraction rule instead. Again we will repeatedly use the
Abacus Math Program – Lesson 15 – Forward Double Rod
Here we will explore the final bead movement in our basic skill training program that looks at executing the 10 pair addition rule twice across two adjacent rods, called the Forward Double Rod. We discussed in Lesson 13 and Lesson 14 the idea of repeatedly using the same basic bead movements over and over again
Abacus Math Program – Lesson 14 – Reverse Double Five
In Lesson 13 we explored the Forward Double Fives in the forward direction for addition. Now let’s take a look at the double fives in the reverse direction for subtraction. We will use the exact same technique but this time we will perform the 10 pair subtraction rule using two 5 pair movements. Let’s work through some
Abacus Math Program – Lesson 13 – Forward Double Five
To this point in our abacus skill training we have introduced all of the basic bead movements required to perform any addition or subtraction problem. To take on problems with larger number sizes, i.e. more digits per number, we will learn how to repeatedly use the basic bead movements over and over again to handle larger
Abacus Math Program – Lesson 12 – The 5/10 Pair Combination Part 2
Lesson 11 the 5/10 Pair Combination Part 1, we introduced the 5/10 pair combination for addition. Here in Lesson 12 Part 2 we will look at the 5/10 pair combination for subtraction. Just like in Lesson 11 Part 1 these examples will demonstrate how we use the 10 pair subtraction rule but instead of directly adding the
Abacus Math Program – Lesson 11 – The 5/10 Pair Combination Part 1
So far in Lesson 5, 6, 7, and 8 we introduced addition and subtraction with 10 pair complements when the operation requires more than 1 rod. In Lesson 9 and 10 we introduced addition and subtraction with 5 pair complements when the operation is done on a single rod, i.e. no carry or borrow is required from
Abacus Math Program – Lesson 10 – Five Pair Complement Part 2
In Lesson 9 Five Pair Part 1 we examined the 5 pair addition rule. Here in Lesson 10 Part 2 we are going to examine the 5 pair subtraction rule. In review there are only two 5 pair complements to consider: 4-1 and 3-2. Let’s take a look at the 5 pair subtraction rule in some examples such as
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