freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/compound-assignment-with-augmented-multiplication.md

---
id: 56533eb9ac21ba0edf2244b1
title: Compound Assignment With Augmented Multiplication
challengeType: 1
videoUrl: 'https://scrimba.com/c/c83vrfa'
forumTopicId: 16662
---

## Description
<section id='description'>
The <code>*=</code> operator multiplies a variable by a number.
<code>myVar = myVar * 5;</code>
will multiply <code>myVar</code> by <code>5</code>. This can be rewritten as:
<code>myVar *= 5;</code>
</section>

## Instructions
<section id='instructions'>
Convert the assignments for <code>a</code>, <code>b</code>, and <code>c</code> to use the <code>*=</code> operator.
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>a</code> should equal <code>25</code>.
    testString: assert(a === 25);
  - text: <code>b</code> should equal <code>36</code>.
    testString: assert(b === 36);
  - text: <code>c</code> should equal <code>46</code>.
    testString: assert(c === 46);
  - text: You should use the <code>*=</code> operator for each variable.
    testString: assert(code.match(/\*=/g).length === 3);
  - text: You should not modify the code above the specified comment.
    testString: assert(/var a = 5;/.test(code) && /var b = 12;/.test(code) && /var c = 4\.6;/.test(code));

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
var a = 5;
var b = 12;
var c = 4.6;

// Only change code below this line
a = a * 5;
b = 3 * b;
c = c * 10;
```

</div>


### After Test
<div id='js-teardown'>

```js
(function(a,b,c){ return "a = " + a + ", b = " + b + ", c = " + c; })(a,b,c);
```

</div>

</section>

## Solution
<section id='solution'>


```js
var a = 5;
var b = 12;
var c = 4.6;

a *= 5;
b *= 3;
c *= 10;
```

</section>