Question

tell me how to multiply Numbers between 11 & 20 using trick?

Answer 1

12*13 , 12*15............................just multiply....it wont take much time lol

Answer 2

hey i want trick dude

Answer 3

first add the digits of 20

2 + 0 = 2

then put that 2 between the digits of 20 giving you 220

this only works for 11 times two digit numbers though

Answer 4

There is a fast way of multiplying numbers of any length by 11 very easily if you want to hear it?
Regarding other numbers between 11 and 20, let me show an example of how I would work it out:
Say we have 13*15. I would do 13*10=130 and 13*5=65 and add them together to get 13*15=130+65=195.
Breaking down the multiplication into easier blocks is how I do everything in my head. Let me know if you want to know the trick for 11 digit numbers.

Answer 5

traxter
tell me trick?

Answer 6

13 * 11 = 1st digit sum of two digit last didit

Answer 7

\[13\times17=(10+3)\times(10+7)\]
\[=10^2+(3+7)10+(3\times7)\]\[=100+10\times10+21\]\[=100+100+21\]\[=221\]

Answer 8

= 13 *11 = 1 1+3 3

= 143

Answer 9

\[19\times11=10^2+(9+1)\times10+(9\times1)=209\]

Answer 10

yes @Yahoo! that's what i said lol

Answer 11

11 * 20 = 2 (2 + 0) 0 => 220
11* 21 = 2 ( 2+1) 1 => 231
11*22 = 2 ( 2 + 2) 2 = > 242

etc.

Answer 12

OK the trick is as follows. We will be writing our answer as we go along from right to left, underneath the actual question.
Say we have 12345*11. The last digit of the answer is the same as the last digit of the question, so leave the 5 unchanged.
Now look to the next digit to the left, 4. Add this to the number to it's right (4+5=9) and write this under the 4.
Look to the next digit to the left, 3. Add this to the number to it's right (3+4=7) and write this under the 3.
Look to the next digit to the left, 2. Add this to the number to it's right (2+3=5) and write it under the 2.
Look to the next digit to the left, 1. Add this to the number to it's right (1+2=3) and write it under the 1.
Finally, we imagine a 0 before the 1 and do as we have been doing. 0+1=1, which we write as the first digit of the answer.
Overall, we have the answer as 135795.
Let me know if you need more clarification of the method, the trick is to do it and write the answer down right to left under the question as you go along.

Answer 13

can that solve 11111 * 11 @Traxter ?

Answer 14

122221

Answer 15

hmm weird...that should've come out as 12344321 or something... i guess i had he wrong digits

Answer 16

I'll show you step by step with drawings how to do it if you like?

Answer 17

Leave first digit as it is.
Look at next digit to left, add to the digit on it's right.
keep going, writing the next digit of the answer below the next digit in the question...
Imagine a zero before the first digit of question and do the same trick.
Does that make more sense? It's strange because you work out the answer from right to left, but with some practice it's great.