The 11 Rule Expanded
You can directly write
down the answer to any number multiplied by 11.
- Take for example the number 51236 X 11.
- First, write down the number with a zero in front of it.
051236
The zero is necessary so that the rules are simpler.
- Draw a line under the number.
- Bear with me on this one. It is simple if you work through it slowly.
To do this, all you have to do this is "Add the neighbor". Look at the 6
in the "units" position of the number. Since there is no number to the
right of it, you can't add to its "neighbor" so just write down 6 below
the 6 in the units col.
- For the "tens" place, add the 3 to the its "neighbor" (the 6). Write
the answer: 9 below the 3.
- For the "hundreds" place, add the 2 to the its "neighbor" (the 3).
Write the answer: 5 below the 2.
- For the "thousands" place, add the 1 to the its "neighbor" (the 2).
Write the answer: 3 below the 1.
- For the "ten-thousands" place, add the 5 to the its "neighbor" (the
1). Write the answer: 6 below the 5.
- For the "hundred-thousands" place, add the 0 to the its "neighbor"
(the 5). Write the answer: 5 below the 0.
That's it ... 11 X 051236 =
563596
