The **multiply ( *)** operator allows you to multiply two numbers together and get their product.

`number * number multiply(number, number) number.multiply(number)`

The `*`

operator follows the standard mathematical order of operations (PEMDAS). For more detail, see Operator Precedence.

You can also use the function version, `multiply()`

.

## Example Formulas

```
12 * 4 /* Output: 48 */
multiply(12, -4) /* Output: -48 */
-12.multiply(4) /* Output: -48 */
```

### Working with 3 or More Operands

Since **multiply** is a binary operator, it can only work on two *operands –* the objects which are being operated on (if – the *ternary operator –* is the only operator that works on three operands).

If you need to work with more than two operands, the shorthand `*`

is by far the easiest way to do it.

```
4 * 5 * 5 /* Output: 100 */
multiply(multiply(4, 5), 5) /* Output: 100 */
4.multiply(5).multiply(5) /* Output: 100 */
```

Yes! Remember that the commutative property of multiplication states that the factors in a multiplication problem can be switched around without changing the final product.

## Example Database

The example database below shows the interest owned by three pirates who smartly invest some of their savings.

The **Interest Earnings** formula shows the total amount of interest that their investment generates over a number of years, given a specific interest rate.

### View and Duplicate Database

This example uses the simple interest formula \(Prt\), where:

- \(P\) is the principal
- \(r\) is the rate of interest converted to a decimal (e.g. 7% is converted to 0.07)
- \(t\) is the number of period (in this case, years)

To get a final balance (principal + simple interest), you’d use the formula \(A = P(1+rt)\).

See that example at the Simple Interest Calculator database, or learn more with this Calculator Soup calculator.

### “Interest Earnings” Property Formula

```
prop("Investment") * prop("Interest Rate") * prop("Years")
```

Instead of using hard-coded numbers, I’ve called in each property using the `prop()`

function.