Basic Math Examples

0.4 \cdot 20

$0.4 \cdot 20$

Step 1

Multiply using long multiplication.

Tap for more steps...

Step 1.1

Multiply

0

$0$ by

4

$4$ . Place the result in the next column in the result line. There is one result line for each digit in

20

$20$ .


	$0$ $0$	. $4$ $4$
$\times$ $⨯$	$2$ $2$	$0$ $0$
		$0$ $0$

Step 1.2

Multiply

0

$0$ by

0

$0$ . Place the result in the next column in the result line. There is one result line for each digit in

20

$20$ .


	$0$ $0$	. $4$ $4$
$\times$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$

Step 1.3

Multiply

2

$2$ by

4

$4$ . Place the result in the next column in the result line. There is one result line for each digit in

20

$20$ .


	$0$ $0$	. $4$ $4$
$\times$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
	$8$ $8$

Step 1.4

Multiply

2

$2$ by

0

$0$ . Place the result in the next column in the result line. There is one result line for each digit in

20

$20$ .


	$0$ $0$	. $4$ $4$
$\times$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$0$ $0$	$8$ $8$

Step 1.5

Add the numbers in each column. In this case, add

0 + 0

$0 + 0$ , then place the

0

$0$ in the result line.


	$0$ $0$	. $4$ $4$
$\times$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$0$ $0$	$8$ $8$
		$0$ $0$

Step 1.6

Add the numbers in each column. In this case, add

0 + 8

$0 + 8$ , then place the

8

$8$ in the result line.


	$0$ $0$	. $4$ $4$
$\times$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$0$ $0$	$8$ $8$
	$8$ $8$	$0$ $0$


	$0$ $0$	. $4$ $4$
$\times$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$0$ $0$	$8$ $8$
	$8$ $8$	$0$ $0$

Step 2

To find the number of decimal places needed in the answer, add the number of decimal places in the multiplier and multiplicand. In this case, there is a total of

1

$1$ , so the answer must have

1

$1$ decimal places as well.

8

$8$