schoolash.blog - Children must have still felt the difficulty of memorizing basic multiplication which totals nearly 100.

There is a simple technique if oblivious to the basic multiplication.

Following methods:

Suppose we want to know what is the value of multiplying 7 x 8

Fill in the circle below the number 7 from the reduction of 10 -7 is 3. Fill in the circle below the number 8 from the reduction of 10-8 which is 2.

7 x 8 multiplication result can be searched in the following ways:

The first digit reductions obtained from 7 - the circle into two namely 7-2

or can be obtained from the first digit reduction in 8 - circle one that is 8-3

The results of both must be the same ie 5

The second digit multiplication value obtained from circle 1 to circle 2 is 3 x 2

So when combined with the first digit to 2 digits will be obtained 56

What about the above process?

Are you still confused?

Let's try again with some other multiplication eg 8 x 9

- We create 2 circles under the number 8 and 9

- We fill the first circle with a value of 10-8 = 2

- We fill the second circle with a value of 10-9 = 1

- We compute the first digit of the result of multiplication yait 8-1 or 9 -2 would obtained a score of 7

- We calculate the second digit of the theoretical value of loop 1 and loop 2 is 2x 1 = 2

the importance of the incorporation of 72 digit1 and digit2

so 8x9 = 72

Hopefully from the above two examples you can easily practice it

Development of methods

Multiplication 2 digit number near 100

The above method can be further developed to compute the fast multiplication of two digit numbers approaching 100.

eg 98 x 92

process such as the following:

- Create a circle under the 98 and 92

- The contents of the first circle = 100-98 = 2

- The contents of the second circle = 100-92 = 8

- Get the first 2 digits -> 98-8 = 90 or 92 -2

- 2 digits both acquired -> 8 x 2 = 16

So a 98 x 92 is 9016

looking for 97x97 multiplication results?

said:

- Create a circle under the 97 and 97

- The contents of the first circle = 100-97 = 3

- The contents of the second circle = 100-97 = 3

- Get the first 2 digits -> 97-3 = 94

- 2 digits both acquired -> 3 x 3 = 09 -> 9

then the value 97x97 is 9409