Muhammad ibn Musa al-Khwarizmi

Modern life owes a lot to Al-Khwarizmi and his fellow scholars who worked and studied in the House of Wisdom in the early 800's CE. This time was the Islamic Golden Age and the place is what is now Iraq but was then a part of the Persian Empire. These scholars revolutionised the digital number system using the arabic-indic numbers ٠(0), ١(1), ٢(2), ٣(3), ٤(4), ٥(5), ٦(6), ٧(7), ٨(8), and ٩ (9). Inventing the concept and use of 0, which is one of the most important parts of our decimal counting system!

Al-Khwarizmi himself made important discoveries and wrote many books on areas such as Algebra, Arithmetic (Math), Astronomy, Trigonometry, Geography, The Jewish calendar and more. The word algebra itself comes from the title of his book "Kitab al-Jabr wa-al-muqabala" or "The Compendious Book on Calculation by Completion and Balancing".

Likey born in Khwarezm, in current Uzbekistan (Muhammad related to Musa from the Khwarizmi area/family), his last name is where we get the word algorithm from. Algorithms are precise, unambiguous step by step instructions. All computer programs are machine-readable algorithms. In computer science, it is one of the fundamental areas of study. He described how to do many math algorithms, like how to do long division and multiplication (like "carry the one").

What makes our decimal system so useful is place value and the easy conversion between 100s, 10s, 1s, 10ths etc. and the place value holder of 0, and that was all thanks to the hard work of Muhammad ibn Musa al-Khwarizmi and other scholars in the House of Wisdom.

</div>
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<div class="js track-popup_tracks">
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<div class="track-popup_course-left">
<div class="track-popup_course-left-content">
<h2 class="track-popup_course-name">{{name}} {{type}}</h2>
<p class="track-popup_course-info">{{{description}}}</p>
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<div class="track-popup_course-right">
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<a href="{{url}}" class="track-popup_course-button {{#if ../disableTrack}}is-disabled{{/if}}">{{../startNowButton}}</a>
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<div class="guides-info-section">
<h3 class="guides-info-section_heading">Key</h3>
<div class="js guides-info-section_key">
<p class="js guides-info-section_key-text">There are five types of lesson segments:</p>
<i class="guides-info-section_key-icon icon-ca-puzzle"></i> <span class="guides-info-section_type">Concepts</span>: <p class="guides-info-section_key-description">Notes on the concepts covered in the CA lessons.</p>
<i class="guides-info-section_key-icon icon-ca-rocket"></i> <span class="guides-info-section_type">Activities</span>: <p class="guides-info-section_key-description">Off-line and online activities to supplement the CA lessons. </p>
<i class="guides-info-section_key-icon icon-ca-ca-logo"></i> <span class="guides-info-section_type">CA Lessons</span> = <p> class="guides-info-section_key-description"Online lessons created by CA.</p>
<i class="guides-info-section_key-icon icon-ca-ca-logo"></i> <span class="guides-info-section_type">CA Projects</span> = <p class="guides-info-section_key-description">Online projects created by CA to reinforce your learning.</p>
<i class="guides-info-section_key-icon icon-ca-ca-logo"></i> <span class="guides-info-section_type">CA Quizzes</span> = <p class="guides-info-section_key-description">Online quizzes created by CA to review previous lessons.</p>
<p class="js guides-info-section_key-text">These small segments can be organised into three sections</p>
<p><span>Prior Learning</span>: These are recap/review segments</p>
<p><span>The Lesson</span>: This section leads you through the concepts, activities and CA lessons.</p> 
<p><span>Extension</span>: These are additional concepts, activities and lessons.</p>
  </div>
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<div class="js purchase-item {{handler}} {{type}} {{#if purchased}}has-purchased{{/if}} {{#if isComplete}}is-complete{{/if}} {{#if new}}-new{{/if}}" {{#if id}} data-id="{{id}}" {{/if}} {{#if plan}} data-plan="{{plan}}" {{/if}} {{#if item}} data-item="{{item}}" {{/if}} {{#if url}} data-url="{{url}}" {{/if}}>
<img src="{{img}}" class="purchase-item_img">
<p class="purchase-item_header">{{title}}</p>
    {{#if description}}
<p class="purchase-item_text">{{description}}</p>
    {{/if}}
<p class="purchase-item_price"><span class="purchase-item_price-price {{#if salePrice}}-strikethrough{{/if}}">{{price}}</span> {{#if salePrice}}<span class="purchase-item_price-sale">{{salePrice}}</span>{{/if}}</p>
<p class="purchase-item_type">USD {{per}}</p>
<div class="purchase-item_buttons">
      {{#each buttons}}
        {{#if url}}
<a href="{{url}}" {{#if target}} target="{{target}}" {{/if}} class="js purchase-item_button external-link" title="{{text}}">{{text}}</a>
        {{else}}
<button class="js purchase-item_button {{hander}}" title="{{text}}">
<span class="js show-spinner">{{text}}</span>
<div class="js show-spinner" data-loader="circle-side"></div>
          </button>
        {{/if}}
      {{/each}}
    </div>
    {{#if info}}
<p class="purchase-item_info">{{info}}</p>
    {{/if}}
  </div>

<div class="js payment-form">
<div class="payment-form_content">
      {{{header}}}
<div class="payment-form_inputs">
<div class="js payment-form_input-wrapper -wide -radios">
<div class="js payment-form_option" data-type="ccd">
<label class="js payment-form_label" title="{{creditCard}}">{{creditCard}}</label> 
<span class="js payment-form_option-radio is-active"></span>
          </div>
<div class="js payment-form_option" data-type="paypal">
<label class="js payment-form_label" title="Paypal">Paypal</label> 
<span class="js payment-form_option-radio"></span> 
          </div>
        </div>
      </div>
<form class="js payment-form_input-wrapper -wide ccd_form">

<div class="payment-form_inputs">
<div class="payment-form_input-wrapper">
<label class="js payment-form_label">{{firstName}} *</label>
<input class="js payment-form_input -dark" type="text" data-recurly="first_name">

</div>
<div class="payment-form_input-wrapper">
<label class="js payment-form_label">{{lastName}} *</label>
<input class="js payment-form_input" type="text" data-recurly="last_name">

</div> 
        </div>
        
        {{#if includeSignup}}
<div class="js payment-form_inputs include-signup">
<div class="payment-form_input-wrapper">
<label class="js payment-form_label">{{email}} *</label>
<input class="js payment-form_input -dark" type="email">

</div>
<div class="payment-form_input-wrapper">
<label class="js payment-form_label">{{password}} *</label>
<input class="js payment-form_input" type="password">

</div> 
          </div>
        {{/if}}

<div class="payment-form_inputs">
<div class="payment-form_input-wrapper">
<label class="js payment-form_label">{{cardNumber}} *</label>
<div data-recurly="number"></div>
          </div>
<div class="payment-form_input-wrapper">
<label class="js payment-form_label">CVV *</label>
<div data-recurly="cvv"></div>
          </div> 
        </div>
<div class="payment-form_inputs">  
<div class="payment-form_input-wrapper">
<label class="js payment-form_label">{{month}} *</label>
<div data-recurly="month"></div>
          </div>
<div class="payment-form_input-wrapper">
<label class="js payment-form_label">{{year}} *</label>
<div data-recurly="year"></div>
          </div> 
<input type="hidden" name="recurly-token" data-recurly="token">

</div>
      </form>
<div class="payment-form_input-wrapper -wide js code">
<label class="js payment-form_label">{{couponCode}} </label>
<input type="text" name="coupon" class="js payment-form_input">

</div>
      
      {{#if includeSignup}}
<div class="js payment-form_input-wrapper include-signup">
<span class="js payment-form_option-checkbox policy-consent -dark" data-value="yes"></span>
<label class="js payment-form_label -checkbox -no-caps">
            {{{consent}}}
          </label>
        </div>
      {{/if}}

<div class="payment-form_buttons">
<div class="js payment-form_error"></div>
<button class="js payment-form_continue-button">
<span class="payment-form_continue-button-text js show-spinner">{{buttonText}}</span>
<div class="js show-spinner" data-loader="circle-side"></div>
        </button>
      </div>
    </div>
  </div>

<!doctype html>

<body class="slide -{slideType}">
<header class="slide_header"> 
<i class="slide_logo icon-ca-ca-logo"></i>
<span class="slide_title">{header}</span>
<div class="slide_controls">
<button id="presentation-jump" class="js slide_controls-button -jump" onclick="window.opener.ai.presentation.previousSlide(true)"><i class="slide_controls-icon icon-ca-left-arrow -double"></i><i class="slide_controls-icon icon-ca-left-arrow -double"></i></button>
<button id="presentation-prev" class="js slide_controls-button -prev" onclick="window.opener.ai.presentation.previousSlide(false)"><i class="slide_controls-icon icon-ca-left-arrow"></i></button>
<button id="presentation-next" class="js slide_controls-button -next" onclick="window.opener.ai.presentation.nextSlide(false)"><i class="slide_controls-icon icon-ca-right-arrow"></i></button>
<button id="presentation-skip" class="js slide_controls-button -skip" onclick="window.opener.ai.presentation.nextSlide(true)"><i class="slide_controls-icon icon-ca-right-arrow -double"></i><i class="slide_controls-icon icon-ca-right-arrow -double"></i></button>
</div>
</header>

{content}
</section>

</body>

<div class="js- projects-popup -{{type}}">
<div class="js- projects-popup_top">
    {{#if image}}
<div class="js- projects-popup_image-wrapper">
      {{#if promo}}{{else}}<div class="projects-popup_image-overlay"></div>{{/if}}
<img src="{{image}}" class="js- projects-popup_image">

</div>
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<div class="projects-popup_info">
<div class="projects-popup_header">
<span class="js- projects-popup_title">{{{name}}}</span>
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<div class="projects-popup_progress-bar">
<div class="js- projects-popup_progress {{{theme}}}" style="width: {{progress}}%"></div>
          </div>
        {{/equals}}
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<div class="js- projects-popup_bottom">
<div class="projects-popup_info">
<div class="projects-popup_header">
<span class="js- projects-popup_title">{{{name}}}</span>
        {{#if time}}<span class="js- projects-popup_time">{{{time}}}</span>{{/if}}
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<div class="projects-popup_progress-bar">
<div class="js- projects-popup_progress {{{theme}}}" style="width: {{progress}}%"></div>
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        {{/equals}}
      {{/compare}}
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    {{#if image}}
<div class="js- projects-popup_image-wrapper {{#if promo}}-promo{{/if}}">
      {{#if promo}}{{else}}<div class="projects-popup_image-overlay"></div>{{/if}}
<img src="{{image}}" class="js- projects-popup_image">

</div>
    {{/if}}
  </div>
</div>

<div class="pdf-header_title">{{name}} Answers</div>
</header>
<section class="pdf-section">
  {{#each lessons}}
<div class="pdf-section_lesson-title">{{lessonNo}}. {{{title}}}</div>
    {{#each tasks}}
<div class="pdf-section_task">
<h2 class="pdf-section_task-title">{{lessonNo}}.{{taskNo}}. {{{objective}}}</h2>
        {{#if solution}}
<pre class="prettyprint pdf-section_code">{{{solution}}}</pre>
        {{else if questions}}
<p>Review Quiz Questions:<br>

<ol class="pdf-section_list">
            {{#each questions}}
<li class="pdf-section_list-item">{{{answer}}}
            {{/each}}
          </ol>
        {{else if answer}}
<p>{{{answer}}}
        {{/if}}
      </div>
    {{/each}}
  {{/each}}
</section>
<script>addEventListener("load", function (event) { prettyPrint() }, false);</script>

<div class="pdf-header_title">{{name}} Instructions</div>
</header>
<section class="pdf-section">
  {{#each lessons}}
<div class="pdf-section_lesson-title">{{lessonNo}}. {{{title}}}</div>
    {{#each tasks}}
<div class="pdf-section_task">
<h2 class="pdf-section_task-title">{{lessonNo}}.{{taskNo}}. {{{objective}}}</h2>
        {{#if goal}}
          {{{goal}}}
        {{/if}}
        {{#if questions}}
<p>Review Quiz Questions:<br>

<ol class="pdf-section_list">
            {{#each questions}}
<li class="pdf-section_list-item">{{{question}}}
            {{/each}}
          </ol>
        {{/if}}
        {{#if answer}}
<p>{{{answer}}}
        {{/if}}
      </div>
    {{/each}}
  {{/each}}
</section>
<script>addEventListener("load", function (event) { prettyPrint() }, false);</script>

<div class="js competition-completion">
        <span class="dot1"></span>
        <span class="dot2"></span>
        <span class="dot3"></span>
        <span class="dot4"></span>
        <span class="dot5"></span>
        <span class="dot6"></span>
        <span class="dot7"></span>
        <span class="dot8"></span>
        <span class="dot9"></span>
        <span class="dot10"></span>
        <span class="dot11"></span>
        <span class="dot12"></span>
        <span class="dot13"></span>
        <span class="dot14"></span>
        <span class="dot15"></span>
        <span class="dot16"></span>
        <span class="dot17"></span>
        <span class="dot18"></span>
        <span class="dot19"></span>
        <span class="dot20"></span>
        <p><span>Mission Status</span></p>
        <h1>You <br /> Escaped</h1>
        <div class="js competition-share-content">
            <div class="competition-completion_info">
                <p><span>Time:</span> {{totalTime}}</p>
                <p><span>Hints:</span> {{totalHintsUsed}}</p>
            </div>
        </div>
        <div class="competition-completion_buttons">
            <button class="js competition-completion_leaderboards"><i class="icon-platform-medal"></i> Leaderboards</button>
            <button class="js competition-completion_share"><i class="icon-platform-share"></i> Share</button>
            <button class="js competition-completion_certificate"><i class="icon-platform-download"></i> Download Certificate</button>
        </div>
        <div class="competition-completion_prizes">
            <p><span>Prize Information</span></p>
            <p>Some prize info</p>
        </div>
    </div>

{{#each this}}
<div class="course-box -{{theme}}">
<div class="course-box_content">
<div class="course-box_top-bar">
<div class="course-box_top-bar-left">
<span class="course-box_type">{{level}}</span>
<span class="course-box_title">{{{name}}}</span>
          </div>
<div class="course-box_top-bar-right">
<span>{{hours}} HRS</span>
<span class="course-box_top-post"></span>
<span class="course-box_preview-btn">Preview <i class="icon-ca-play-full course-box_preview-btn-triangle"></i></span>
          </div>
        </div>
<div class="course-box_details">
<p class="course-box_description">{{{description}}}</p>
<div class="course-box_buttons">
<div class="course-box_buttons-left">
              {{#if progress}}
<a href="{{url}}" class="button course-box_resume-button">Resume</a>
              {{else}}
<a href="{{url}}" class="button course-box_resume-button">Start</a>
              {{/if}}
            </div>
<div class="course-box_buttons-right">
<button class="button course-box_details-button">View Details</button>
<div class="course-box_content-footer">
<div class="course-box_footer-info">
                  
                </div>
<div class="course-box_footer-info">
                  {{difficulty}}
                </div>
<div class="course-box_footer-info">
                  {{taskCount}} Tasks
                </div>
              </div>
            </div>
          </div>
<div class="course-box_footer">
<div class="course-box_footer-info">
                  
            </div>
<div class="course-box_footer-info">
              {{difficulty}}
            </div>
<div class="course-box_footer-info">
              {{taskCount}} Tasks
            </div>
          </div>
        </div>
      </div>
<div class="course-box_preview">
        {{#if image}}
<div class="course-box_preview-image">
<image src="{{image}}" class="course-box_preview-image-image">
          </div>
        {{else}}
<div class="course-box_preview-video">
<div class="course-box_preview-video-play">
<div class="course-box_preview-video-play-icon">
<i class="icon-ca-play"></i>
              </div>
            </div>
          </div>  
        {{/if}}
      </div>
<div class="course-box_percentage-top">
<span class="course-box_percentage-circle"></span>
<div class="course-box_percentage-percent-wrapper">
<span class="course-box_percentage-percent" style="width: {{progress}}%"></span>
        </div>
<i class="icon-ca-ribbon-small{{ribbon}} course-box_percentage-ribbon -percent{{progress}}"></i>
      </div>
<div class="course-box_percentage-bottom">
<span class="course-box_percentage-circle"></span>
<div class="course-box_percentage-percent-wrapper">
<span class="course-box_percentage-percent" style="width: {{progress}}%"></span>
        </div>
<i class="icon-ca-star course-box_percentage-star"></i>
<i class="icon-ca-ribbon-small{{ribbon}} course-box_percentage-ribbon -percent{{progress}}"></i>
      </div>
    </div>
  {{/each}}

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<style>
    html {
        font-size: 0 !important;
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.t-quiz > * {
        font-size: initial !important;
        margin-bottom: 0 !important;
    }
</style>
<link rel="stylesheet" href="/dist/style.min.css?0.052468554855654936">
{{#each css}}
{{/each}}
<script>
    window.CHINA = true;
    window._MIN_ = '';
    window.CURRENT_VERSION = '1';
    window.IFRAME = true;
</script>
<script src="/js/jquery.js?v=yOKaW5htuhTZ_ZEWQ-n3h0ennNBkN3zmVmtasuaxVKk"></script>
<script src="/js/jquery-ui.min.js?v=_CzTpg6QTje_ISm9yjDTYORSNm5j6oJ56j0nP6TCzhc"></script>

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<title>{title}</title>
<meta name="viewport" content="width=device-width">

canvas {
        background-color: white;
        border: 1px solid black;
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table {
        position: absolute;
        width: 360px;
        height: 300px;
        background-color: black;
        top: 50%;
        opacity: 0.9;
        margin: auto;
        margin-top: -150px;
        left: 0;
        right: 0;
        cursor: pointer;
    }

td {
        padding: 24px;
    }

p {
        line-height: 28px;
    }

.social-share img {
        width: 20px;
        height: 20px;
        vertical-align: middle;
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h1 {
        font-size: 28px;
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#code {
        display: none;
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</style>

<a href="{protocol}//{domain}"><img src="{protocol}//{domain}/images/logo-full.png"
                                    alt="Code Avengers logo" width="200"
                                    style="margin-top: 20px;"></a>
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<p>Learn to make apps, games and websites with <a style="color: #ef5555" href="/">CodeAvengers.com</a>

<table onclick="this.style.display='none';displayApp()">
<tr>
<td>  
<h2>Instructions</h2>
<p>{instructions}
  
<p>
<b>Click to start</b>

</table>

<div id="code">
{content}
</div>

<!doctype html>

<title>{title}</title>
<meta name="viewport" content="width=device-width">

canvas {
        background-color: white;
        border: 1px solid black;
    }

td {
        padding: 24px;
    }

p {
        line-height: 28px;
    }

.social-share img {
        width: 20px;
        height: 20px;
        vertical-align: middle;
    }

h1 {
        font-size: 28px;
    }

.fullscreen footer, .fullscreen header {
        display: none;
    }

.fullscreen table {
        top: 170px;
    }
</style>

<header>
<a href="{protocol}//{domain}"><img src="{protocol}//{domain}/images/logo-full.png"
                                    alt="Code Avengers logo" width="200"
                                    style="margin-top: 20px;"></a>
<br><span>presents</span>
<h1>"{title}" by {codename}</h1>
</header>

<canvas id="paperscriptCanvas" tabindex="0"
        {canvasEvents} width="{width}" height="{height}"></canvas>

<footer>
<p>Learn to make apps, games and websites with <a style="color: #ef5555;" href="/">CodeAvengers.com</a>

</footer>

<tr>
<td>  
<h2>Instructions</h2>
<p>{instructions}
  
<p>
<b>Click to start</b>

</table>

<title>Code Avengers Profile</title>
<meta name="viewport" content="width=device-width">

<header>
<a href="https://codeavengers.com"><img src="/images/logo.png"></a>
<a href="/m/about.html">About us</a> | <a href="http://blog.codeavengers.com">Blog</a>
</header>
<section>
<h2>My Profile</h2>
<img src="/images/profile9.png" width="180" alt="profile">

</a>
<strong>Name</strong>: Supacoda<br>

<strong>Birthday</strong>: 14<sup>th</sup> April<br>

<strong>Height</strong>: 1.79m<br>

<h3>My Super Powers</h3>
<p>I have super endurance, once I start, I keep going until I finish!
	
<p>I will eat anything and lots of it... if there is a plate with food on it, I will eat it!