Multiplication of numbers with a series of 1’s.

Multiplication of Numbers with a series of 1’s

11, 111, 1111 etc.

It will require some practice to get mastery. Take different numbers and practice. Practice makes the man perfect.

 

32 x 11	First we write the right hand most digit ‘2’ as it is	2
	Next, we add 2 to the number in left 3 ( 2 + 3) i.e. (Unit + tens)	5
	Last we write the left hand most digit 3 as it is	3
Ans		352
43 x 11	First we write the right hand most digit’3’ as it is	3
	Next, we add 3 to the number in left 4 (4 + 3) = 7 i.e. (Unit + Tens)	7
	Last we write the left hand most digit 4 as it is	4
Ans		473
64 x 11		4
	6 + 4 = 10 write 0 and carry 1	0
	6 + 1 (carried)	7
Ans		704
652 x 11	We write down the last digit as it is	2
	Next, we add 2 to 5 and make it 7 (Unit + Tens)	7
	Next, we add 5 to 6 to get 11. Write 1 and carry 1 ( tens + Hundreds)	1
	Last we take 6 and add carried number to get 7	7
Ans		7172
3102 x 11	W write down 2 as it is	2
	We add 2 to 0 and make it 2 (U + T)	2
	We add 0 to 1and make it 1 (T + H)	1
	We add 1 to 3 and make it 4 ( H + TT)	4
	We write the first digit 3 as it is	3
Ans		34122
201432 X 111	We write down 2 as it is	2
	We move to the left and add (2 + 3 ) U + T)	5
	We move to the left and add ( 2 + 3 + 4) ( U + T + H)	9
	We move to the left and add (3 + 4 + 1)  (T + H + T)	8
	We move to the left and add (4 + 1 + 0 ) (H + T+TT)	5
	We move to the left and add (1+0+2) (T + TT + L)	3
	We move to the left and add (0 + 2) (TT + L)	2
	We write the last digit as it is 2 (L)	2
Ans		22358952