Pre-Algebra Examples

28 \cdot 9

$28 \cdot 9$

Step 1

Multiply using long multiplication.

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Step 1.1

Multiply

9

$9$ by

8

$8$ . Place the ones digit

(2)

$(2)$ in the result line and carry the tens digit

(7)

$(7)$ . There is one result line for each digit in

9

$9$ .

Step 1.2

Multiply

9

$9$ by

2

$2$ and add the carried

7

$7$ . Place the ones digit

(5)

$(5)$ in the result line and carry the tens digit

(2)

$(2)$ . There is one result line for each digit in the

9

$9$ .

Step 1.3

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

2

$2$ , then place the

2

$2$ in the result line.

Step 1.4

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

5

$5$ , then place the

5

$5$ in the result line.

Step 1.5

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

2

$2$ , then place the

2

$2$ in the result line.

Step 2

The result of

28 \cdot 9

$28 \cdot 9$ is

252

$252$ .

252

$252$