Some people are such brainiacs.
The 11 Times Trick
We all know the trick whenby ten – add 0 of the number,
but did you know there is an equally easy trick for multiplying a two digit number
by 11? This is it:
Takenumber and imagine a space between the two digits (in this
example we will use 52:
Now add the two numbers together and put them in:
That is it – you have the answer: 572.
Ifin the middle add up to a 2 digit number, just insert the
second number and add 1 to the first:
1089 – It works every time.