Tip#2 : How to Multiply a number with 11 easily less than 5 seconds

How to Multiply a number with 11 easily

Tip: keeping the leftmost and right most numbers as is, add the numbers with its next number and put it in between leftmost and right most

Let us take an example of multiplying 25 with 11 

• Step 1 : keep 2 as is
• Step 2: add 2 and its next number i.e. 2 + 5 = 7
• Step 3: now keep 5 next to 7
• (2) (2+5) (5) = 275 is the answer

Another example:

• Multiply 159 with 11 = 159 x 11
• (1) (1+5) (5+9) (9) = (1) (6) (14) (9)
• Here 14 is having value more than 10, so this should be added to its previous number i.e. 6 in this scenario.
• (1) (6+1) (4) (9) = 1749 is the answer

One more example

• Multiply 4251 with 11
• (4) (2) (5) (1) 
• (4) (4+2) (2+5) (5+1) (1)
• (4) (6) (7) (6) (1)
• Answer is 46761

Try the following on your own:

43 x 11 = ?

923 x 11 = ?

4929 x 11 = ?

Feel free to write to me kosuru@gmail.com for any further help / suggestions