Pre-Algebra Examples

$8.5 \cdot 10$

Step 1

Multiply using long multiplication.

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Step 1.1

Multiply $0$ by $5$ . Place the result in the next column in the result line. There is one result line for each digit in $10$ .


	$8$	. $5$
$⨯$	$1$	$0$
		$0$

Step 1.2

Multiply $0$ by $8$ . Place the result in the next column in the result line. There is one result line for each digit in $10$ .


	$8$	. $5$
$⨯$	$1$	$0$
	$0$	$0$

Step 1.3

Multiply $1$ by $5$ . Place the result in the next column in the result line. There is one result line for each digit in $10$ .


	$8$	. $5$
$⨯$	$1$	$0$
	$0$	$0$
	$5$

Step 1.4

Multiply $1$ by $8$ . Place the result in the next column in the result line. There is one result line for each digit in $10$ .


	$8$	. $5$
$⨯$	$1$	$0$
	$0$	$0$
$8$	$5$

Step 1.5

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


	$8$	. $5$
$⨯$	$1$	$0$
	$0$	$0$
$8$	$5$
		$0$

Step 1.6

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


	$8$	. $5$
$⨯$	$1$	$0$
	$0$	$0$
$8$	$5$
	$5$	$0$

Step 1.7

Add the numbers in each column. In this case, add $0 + 8$ , then place the $8$ in the result line.


	$8$	. $5$
$⨯$	$1$	$0$
	$0$	$0$
$8$	$5$
$8$	$5$	$0$


	$8$	. $5$
$⨯$	$1$	$0$
	$0$	$0$
$8$	$5$
$8$	$5$	$0$

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 $1$ , so the answer must have $1$ decimal places as well.

$85$