Pre-Algebra Examples

$10 \cdot 21$

Step 1

Multiply using long multiplication.

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Step 1.1

Multiply $1$ by $0$ . Place the result in the next column in the result line. There is one result line for each digit in $21$ .

Step 1.2

Multiply $1$ by $1$ . Place the result in the next column in the result line. There is one result line for each digit in $21$ .

Step 1.3

Multiply $2$ by $0$ . Place the result in the next column in the result line. There is one result line for each digit in $21$ .

Step 1.4

Multiply $2$ by $1$ . Place the result in the next column in the result line. There is one result line for each digit in $21$ .

Step 1.5

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

Step 1.6

Add the numbers in each column. In this case, add $1 + 0$ , then place the $1$ in the result line.

Step 1.7

Add the numbers in each column. In this case, add $0 + 2$ , then place the $2$ in the result line.

Step 2

The result of $10 \cdot 21$ is $210$ .

$210$