MULTIPLICATION OF A NUMBER BY 12
This method is just similar to 11
Add ‘0’ to both the ends of the given number
Starting from right hand side, take two digits each time
Multiply the left side digit by 2 and add the result to the right side digit
Continue like this till the last pair of digits
Let us take an example,
69384 x 12
0693840
starting from right hand side
4 x 2 + 0 8
8 x 2 + 4 (2)08
3 x 2 + 8(+2) (1)608
9 x 2 + 3(+1) (2)2608
6 x 2 + 9(+2) (2)32608
0 x 2 + 6(+2) 832608
69384 x 12 = 832608
One more example,
724635 x 12
07246350
5 x 2 + 0 (1)0
3 x 2 + 5(+1) (1)20
6 x 2 + 3(+1) (1)620
4 x 2 + 6(+1) (1)5620
2 x 2 + 4(+1) 95620
7 x 2 + 2 (1)695620
0 x 2 + 7(+1) 8695620
724635 x 12 = 8695620
Now try these
11. 793543 x 12
12. 3926584 x 12
13. 5371843 x 12
14. 79658 x 12
15. 47396835 x 12