Multiplication of Decimal numbers

Multiplication (Single digit after decimal)

     2 . 3   

*        2            

________

    4 . 6  

________

     8 . 1        

*      9      

_______

7 2 . 9 

________

     3 . 3 

*     2 

   ______

    6 . 6   

 _______

     4 .0   

*      2   

   ________

   8 .  0  

 ________

     7  . 1

*         6 

   ___

   4  2 .  6  

  ____

     5 . 3 

*        0 

   ___

   0 . 0 

  ____

Interactive Activity

	3	.	4
*			2
		.

		9	.	2
*				3
			.

		4	.	4
*				3
			.

		5	.	1
*				4
			.

		8	.	2
*				5
			.

Multiplication (1, 2, 3 digits after decimal)

		2	2
		1	4	.	4	(1 digit after the decimal.)
*				1	5
	__________
		1
			7	2	0
+		1	4	4
	__________
		2	1	6	.0	(Since there is 1 digit after the decimal.)

		1
		3	9	.	2	1	(2 digits after the decimal.)
*					2	0
		__________
			0	0	0	0
+		7	8	4	2
		__________
		7	8	4	.2	0	(Since there are 2 digits after the decimal.)

		2	2
		1	4	.	4	0	2	(3 digits after the decimal.)
*						1	5
		_____________
		1
			7	2	0	1	0
+		1	4	4	0	2
	_____________
		2	1	6	.0	3	0	(Since there are 3 digits after the decimal.)

Interactive Activity

		2	5	.	5
*			1		5
_______________________________________
+
_______________________________________
				.

			3	9	.	3	2
*						3	0
___________________________________________________________
+
___________________________________________________________
					.

Multiplication (of two decimal numbers)

		2	2
		1	4	.	4	(1 digit after the decimal.)
*			5	.	2	(1 digit after the decimal.)
	__________
			2	8	8
+		7	2	0
	__________
		7	4	.8	8	(Count the number of digits after decimal in both the numbers. Place the decimal before the number of digits, 2 in this case counting from right to left in the answer.)

		1
		1	2	.	0	1	(2 digits after the decimal.)
*			0	.	2	0	(2 digits after the decimal.)
		__________
			0	0	0	0
+		2	4	0	2
		__________
		2	.4	0	2	0	(Since there are 2 digits after the decimal in each number, decimal is placed 4 digits counting from right to left.)

			0	.	1	1	1	(3 digits after the decimal.)
*			0	.	1	1	1	(3 digits after the decimal.)
		_____________
					1	1	1
+				1	1	1
			1	1	1
	_____________
	0	.0	1	2	3	2	1	(Since decimal has to be placed before 6 digits and we only have 5 digits in the result, an extra 0 is added to make it 6 digits.)

Interactive Activity

			2	5	.	5
*				6	.	3
_____________________________________________________
+
_____________________________________________________
				.

		2	3	.	1	2
*			0	.	3	0
_____________________________________________________
+
_____________________________________________________
		.