Basic Math Examples

5 \cdot 21

$5 \cdot 21$

Step 1

Multiply using long multiplication.

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Step 1.1

Multiply

1

$1$ by

5

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

21

$21$ .

Step 1.2

Multiply

2

$2$ by

5

$5$ . Place the ones digit

(0)

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

(1)

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

21

$21$ .

Step 1.3

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

5 + 0

$5 + 0$ , then place the

5

$5$ in the result line.

Step 1.4

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

0 + 0

$0 + 0$ , then place the

0

$0$ in the result line.

Step 1.5

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

0 + 1

$0 + 1$ , then place the

1

$1$ in the result line.

Step 2

The result of

5 \cdot 21

$5 \cdot 21$ is

105

$105$ .

105

$105$