Basic Math Examples

18 \cdot 15

$18 \cdot 15$

Step 1

Multiply using long multiplication.

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Step 1.1

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

15

$15$ .

	$4$ $4$
	$1$ $1$	$8$ $8$
$\times$ $⨯$	$1$ $1$	$5$ $5$
		$0$ $0$

Step 1.2

Multiply

5

$5$ by

1

$1$ and add the carried

4

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

15

$15$ .


	$1$ $1$	$8$ $8$
$\times$ $⨯$	$1$ $1$	$5$ $5$
	$9$ $9$	$0$ $0$

Step 1.3

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

15

$15$ .


	$1$ $1$	$8$ $8$
$\times$ $⨯$	$1$ $1$	$5$ $5$
	$9$ $9$	$0$ $0$
	$8$ $8$

Step 1.4

Multiply

1

$1$ by

1

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

15

$15$ .


	$1$ $1$	$8$ $8$
$\times$ $⨯$	$1$ $1$	$5$ $5$
	$9$ $9$	$0$ $0$
$1$ $1$	$8$ $8$

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.


	$1$ $1$	$8$ $8$
$\times$ $⨯$	$1$ $1$	$5$ $5$
	$9$ $9$	$0$ $0$
$1$ $1$	$8$ $8$
		$0$ $0$

Step 1.6

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

9 + 8

$9 + 8$ , then place the

7

$7$ in the result line and carry the

1

$1$ .


	$1$ $1$	$8$ $8$
$\times$ $⨯$	$1$ $1$	$5$ $5$
	$9$ $9$	$0$ $0$
$1$ $1$	$8$ $8$
	$7$ $7$	$0$ $0$

Step 1.7

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

0 + 1 + 1

$0 + 1 + 1$ , then place the

2

$2$ in the result line.


	$1$ $1$	$8$ $8$
$\times$ $⨯$	$1$ $1$	$5$ $5$
	$9$ $9$	$0$ $0$
$1$ $1$	$8$ $8$
$2$ $2$	$7$ $7$	$0$ $0$


	$1$ $1$	$8$ $8$
$\times$ $⨯$	$1$ $1$	$5$ $5$
	$9$ $9$	$0$ $0$
$1$ $1$	$8$ $8$
$2$ $2$	$7$ $7$	$0$ $0$

Step 2

The result of

18 \cdot 15

$18 \cdot 15$ is

270

$270$ .

270

$270$