Basic Math Examples

$19.1 \cdot 8.5$

Step 1

Multiply $5$ by $1$ . Place the result in the next column in the result line. There is one result line for each digit in $8.5$ .


	$1$	$9$	. $1$
$⨯$		$8$	. $5$
			$5$

Step 2

Multiply $5$ by $9$ . Place the ones digit $(5)$ in the result line and carry the tens digit $(4)$ . There is one result line for each digit in $8.5$ .

	$4$
	$1$	$9$	. $1$
$⨯$		$8$	. $5$
		$5$	$5$

Step 3

Multiply $5$ by $1$ and add the carried $4$ . Place the result in the next column in the result line. There is one result line for each digit in $8.5$ .


	$1$	$9$	. $1$
$⨯$		$8$	. $5$
	$9$	$5$	$5$

Step 4

Multiply $8$ by $1$ . Place the result in the next column in the result line. There is one result line for each digit in $8.5$ .


	$1$	$9$	. $1$
$⨯$		$8$	. $5$
	$9$	$5$	$5$
		$8$

Step 5

Multiply $8$ by $9$ . Place the ones digit $(2)$ in the result line and carry the tens digit $(7)$ . There is one result line for each digit in $8.5$ .

	$7$
	$1$	$9$	. $1$
$⨯$		$8$	. $5$
	$9$	$5$	$5$
	$2$	$8$

Step 6

Multiply $8$ by $1$ and add the carried $7$ . Place the ones digit $(5)$ in the result line and carry the tens digit $(1)$ . There is one result line for each digit in the $8.5$ .


		$1$	$9$	. $1$
	$⨯$		$8$	. $5$
		$9$	$5$	$5$
$1$	$5$	$2$	$8$

Step 7

Add the numbers in each column. In this case, add $5 + 0$ , then place the $5$ in the result line.


		$1$	$9$	. $1$
	$⨯$		$8$	. $5$
		$9$	$5$	$5$
$1$	$5$	$2$	$8$
				$5$

Step 8

Add the numbers in each column. In this case, add $5 + 8$ , then place the $3$ in the result line and carry the $1$ .


		$1$	$9$	. $1$
	$⨯$		$8$	. $5$
		$9$	$5$	$5$
$1$	$5$	$2$	$8$
			$3$	$5$

Step 9

Add the numbers in each column. In this case, add $9 + 2 + 1$ , then place the $2$ in the result line and carry the $1$ .


		$1$	$9$	. $1$
	$⨯$		$8$	. $5$
		$9$	$5$	$5$
$1$	$5$	$2$	$8$
		$2$	$3$	$5$

Step 10

Add the numbers in each column. In this case, add $0 + 5 + 1$ , then place the $6$ in the result line.


		$1$	$9$	. $1$
	$⨯$		$8$	. $5$
		$9$	$5$	$5$
$1$	$5$	$2$	$8$
	$6$	$2$	$3$	$5$

Step 11

Add the numbers in each column. In this case, add $0 + 1$ , then place the $1$ in the result line.


		$1$	$9$	. $1$
	$⨯$		$8$	. $5$
		$9$	$5$	$5$
$1$	$5$	$2$	$8$
$1$	$6$	$2$	$3$	$5$

Step 12

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 $2$ , so the answer must have $2$ decimal places as well.

$162.35$