Apr
21
2009

Multiplication Made Easy (Table 11)

Today’s lucky number is 11. Any single digit multiplied by eleven will result in the double up of the said single digit.

1 x 11 = 11
2 x 11 = 22
3 x 11 = 33
……
9 x 11 = 99

The interesting part is multiplying double or more digits by eleven.

Example 263 x 11=?
Take 263. 2 being the first number and 3 being the last number.
263 x 11
2 + 6 + 3 x 11
Bring down the first number, that is 2
Then (2+6) = 8.
Next (6+3)= 9.
Then bring down the last number, that is 3.
So, 263 x 11 = 2893

……………….
Try again.
8125 x 11
Bring down the first number, 8.
Then (8+1) = 9
Then (1+2) = 3
Then (2+5) = 7
Then bring down the last number, 5.
So, 8125 x 11 = 89375
………………
One more time.
354 x 11
3 + 5 + 4 x 11
3 (8) (9) 4
3894
…………..
Interesting?
Solve this..
2634 x 11
2 + 6 + 3 + 4 x 11
2 (8) (9) (7) 4
28974

Got it?

Try this now.
9627 x 11
9 + 6 + 2 + 7 x 11
9 (15) (8) (9) 7
If the numbers in the bracket are double digits, use the last digit and “add 1” to the previous number.
9 +1 (5) (8) (9) 7
105897

One last time.
81465 x 11
8 + 1 + 4 + 6 + 5 x 11
8 (9) (5) (10) (11) 5
8 9 (5+1) 0 (11) 5
8 9 6 (0+1) 1 5
896115

With this formula, you can multiply thousands, millions or even billions by 11 and get the results in an instant! Try it, you’ll be fascinated! :D

If you like this, you might want to give Table 6 a try too. Click here.

About the Author: Merryn Tan

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I am a mother to two boys; Ethan and Ayden and a wife to Darling William. I'm a stay at home mum who blogs to break the monotony of life and to avoid feeling jaded. Would love to get to know all the Super Mommies and Daddies and Babies or Singles out there with the hope that we can learn more from each other. Most of all, I am a happy person, and I hope YOU are too.

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