Basic Math Examples

17 \cdot 20

$17 \cdot 20$

Step 1

Multiply using long multiplication.

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Step 1.1

Multiply

0

$0$ by

7

$7$ . Place the result in the next column in the result line. There is one result line for each digit in

20

$20$ .


	$1$ $1$	$7$ $7$
$⨯$ $⨯$	$2$ $2$	$0$ $0$
		$0$ $0$

Step 1.2

Multiply

0

$0$ by

1

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

20

$20$ .


	$1$ $1$	$7$ $7$
$⨯$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$

Step 1.3

Multiply

2

$2$ by

7

$7$ . Place the ones digit

(4)

$(4)$ in the result line and carry the tens digit

(1)

$(1)$ . There is one result line for each digit in

20

$20$ .

	$1$ $1$
	$1$ $1$	$7$ $7$
$⨯$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
	$4$ $4$

Step 1.4

Multiply

2

$2$ by

1

$1$ and add the carried

1

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

20

$20$ .


	$1$ $1$	$7$ $7$
$⨯$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$3$ $3$	$4$ $4$

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.


	$1$ $1$	$7$ $7$
$⨯$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$3$ $3$	$4$ $4$
		$0$ $0$

Step 1.6

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

0 + 4

$0 + 4$ , then place the

4

$4$ in the result line.


	$1$ $1$	$7$ $7$
$⨯$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$3$ $3$	$4$ $4$
	$4$ $4$	$0$ $0$

Step 1.7

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

0 + 3

$0 + 3$ , then place the

3

$3$ in the result line.


	$1$ $1$	$7$ $7$
$⨯$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$3$ $3$	$4$ $4$
$3$ $3$	$4$ $4$	$0$ $0$


	$1$ $1$	$7$ $7$
$⨯$ $⨯$	$2$ $2$	$0$ $0$
	$0$ $0$	$0$ $0$
$3$ $3$	$4$ $4$
$3$ $3$	$4$ $4$	$0$ $0$

Step 2

The result of

17 \cdot 20

$17 \cdot 20$ is

340

$340$ .

340

$340$