Wow, this is so simple. I thought the 11 times table was easy enough,
when I used to work it out like this, 11,22,33,44,55 etc...
But what about bigger numbers?
Lets try 12 X 11

This is what you do.
1) forget about the 11 for a moment and just concentrate on the 12.
2) break up the twelve like so 1 and 2
3) Add these two digits together 1 + 2 = 3
4) Place the answer, 3 in between the 12 to give 132
12 X 11 is 132! Isn't that easy?

Try another

48 X 11

Again, leave the 11 alone for a moment and work with the 48
4 + 8 = 12

So now we have to put the 12 in between the 48 but don't do this:
4128 as that is wrong...
First, do this: 428 (taking the 2 from the 12) and then add the 1 to the 4
giving 528

Ok, another one

74 X 11

7+4 = 11

7 ( put the 1 from the right of 11 in) and 4
Then add the 1 from the left of 11 to the 7
814 is the answer!!

This is a really simple method and will save you so much time with your 11 times tables.

So does this method work for bigger numbers?

It does to a certain degree but the method changes slightly...

Lets look at this one:

176 X 11

How do we approach this one?

First we will try this by writing the answer backwards.
So, when always multiplying a large number by 11, the last number will always be the last number of the sum we are multiplying.
Let me explain.
176 is the number we are multiplying.
So the last number in out answer will be 6. If the sum was 143 the last number in our answer would be 3... get it?

So now what?
Easy, just add the next number to the last number, 7 + 6 = 13
So the next last number will be 3, carry the 1.
Add the 7 and 1 together, giving 8, then add the carried 1, 9 then write that number as our next part of the answer, 936

Then, the last number will be the first number in our sum, in this case 1.

So the answer is 1936.

Try 278
Last number is 8
7 + 8 = 15
Second last number is 5, carry the 1
7 + 2 = 9 add the carried 1, 10
Third last number is 0, carry the 1
Add the carried 1 to the first number in the sum, 2 giving:
2 + 1 = 3

So the answer is 3058!

Alternatively, you could always just add a zero to the number you are multiplying and then add the original number to it again...

156 X 11
try it this way:
Add a zero to the end
1560
Add 156 to this

1560 + 156 = 1716
Whatever method works best, stick to it!

Download a free pdf ebook at http://www.vedic-maths-ebook.com/Memorymentor_Maths_tips.pdf

Kevin O'Connor