Basic Math Examples

80 \cdot 1.5

$80 \cdot 1.5$

Step 1

Multiply using long multiplication.

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Step 1.1

Multiply

5

$5$ by

0

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

1.5

$1.5$ .


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

Step 1.2

Multiply

5

$5$ by

8

$8$ . Place the ones digit

(0)

$(0)$ in the result line and carry the tens digit

(4)

$(4)$ . There is one result line for each digit in

1.5

$1.5$ .


	$8$ $8$	$0$ $0$
$⨯$ $⨯$	$1$ $1$	. $5$ $5$
$4$ $4$	$0$ $0$	$0$ $0$

Step 1.3

Multiply

1

$1$ by

0

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

1.5

$1.5$ .


	$8$ $8$	$0$ $0$
$⨯$ $⨯$	$1$ $1$	. $5$ $5$
$4$ $4$	$0$ $0$	$0$ $0$
	$0$ $0$

Step 1.4

Multiply

1

$1$ by

8

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

1.5

$1.5$ .


	$8$ $8$	$0$ $0$
$⨯$ $⨯$	$1$ $1$	. $5$ $5$
$4$ $4$	$0$ $0$	$0$ $0$
$8$ $8$	$0$ $0$

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.


	$8$ $8$	$0$ $0$
$⨯$ $⨯$	$1$ $1$	. $5$ $5$
$4$ $4$	$0$ $0$	$0$ $0$
$8$ $8$	$0$ $0$
		$0$ $0$

Step 1.6

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

0 + 0

$0 + 0$ , then place the

0

$0$ in the result line.


	$8$ $8$	$0$ $0$
$⨯$ $⨯$	$1$ $1$	. $5$ $5$
$4$ $4$	$0$ $0$	$0$ $0$
$8$ $8$	$0$ $0$
	$0$ $0$	$0$ $0$

Step 1.7

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

4 + 8

$4 + 8$ , then place the

2

$2$ in the result line and carry the

1

$1$ .


		$8$ $8$	$0$ $0$
	$⨯$ $⨯$	$1$ $1$	. $5$ $5$
	$4$ $4$	$0$ $0$	$0$ $0$
	$8$ $8$	$0$ $0$
$1$ $1$	$2$ $2$	$0$ $0$	$0$ $0$


		$8$ $8$	$0$ $0$
	$⨯$ $⨯$	$1$ $1$	. $5$ $5$
	$4$ $4$	$0$ $0$	$0$ $0$
	$8$ $8$	$0$ $0$
$1$ $1$	$2$ $2$	$0$ $0$	$0$ $0$

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.

120

$120$