Abacus

An abacus is a counting device. Made of wood and string, or boards with grooves, or even board of sand and rocks. The abacus helped people to count, add and subtract numbers. This Roman abacus is a board with 4 horizontal grooves and 2 rows. The each top groove has 1 beads, each bottom groove has 4.

A wooden abacus with 4 horizontal strings. Each string has 9 beads. — A decimal abacus

A typical abacus, that was used up until the invention of the calculator, has columns of string. It helps record place value. The abacus here is recording the number 4,213 with the position of 10 beads. Place value is very important, you can count up to nine on one column. Once you want to count to ten then you must move one bead on the next column and move the nine beads back to being in the 'uncounted' position.

Hexadecimal abacus — Suanpan, chinese abacus

This suanpan, or chinese abacus, can be used to count in decimal or hexadecimal A wooden abacus with 4 horizontal strings and 2 rows. The each top string has 2 beads, each bottom string has 5. The top strings are multiples of 5, the bottom string each bead means one, ten, hundred.

</div>
<div class="js comments_comment-content">
<div class="comments_comment-profile-info">
<span class="js comments_comment-profile-name">{{codeName}}</span>
        
<span class="js comments_comment-timestamp">{{timestamp}}</span>
      </div>
<p class="js comments_comment-text">{{comment}}
<div class="js comments_comment-buttons">
<span class="js comments_comment-replies-count" data-upvotes="{{upvotes}}">{{upvotes}}</span>
<button class="js comments_comment-up-vote"></button>
<button class="js comments_comment-reply"></button>
      </div>
    </div>
    {{#if parentID}}

{{else}}
<div class="js comments_comment-replies">
        
      </div>
    {{/if}}
  </div>

<div class="guiders-preview_content">
      {{#if complete}}{{else}}
<h4 class="guiders-preview_subtitle">{{subtitle}}</h4>
      {{/if}}
<h2 class="guiders-preview_title">{{{title}}} {{#if complete}}{{{message}}}{{/if}}</h2>
      {{#if complete}}{{else}}
<div class="guiders-preview_description"><p>{{{message}}}</div>
      {{/if}}
      {{#if complete}}
<div class="guiders-preview_social-buttons">
<a href="{{{twitterUrl}}}" target="_blank" onclick="ai.publish(true, null, event);" class="js guiders-preview_social-button -twitter"><i class="guiders-preview_social-icon icon-ca-twitter"></i> {{{twitter}}}</a>
<button class="js guiders-preview_social-button -facebook" onclick="ai.share.facebook();ai.publish(true, null, event);"><i class="guiders-preview_social-icon icon-ca-facebook"></i> {{{facebook}}}</button>
      </div>
      {{/if}}
    </div>
  </div>  
  {{#if tour}}
<p class="guiders-preview_action">{{{action}}}
  {{/if}}

{{#with pricing}}
<div id="pricing-popup">
<div class="pricing">
<h3 class="pricing_header">{{{header}}}</h3>
<p class="pricing_info">
    
    {{{text}}}

<div class="pricing_sections">
    {{#each sections}}
<div class="pricing_section-wrapper">
<div class="pricing_section">
<h3 class="pricing_section-header">{{header}}</h3>
          {{#if list}}
            {{#each list}}
<p class="pricing_section-info">{{this}}
            {{/each}}
          {{else}}
<p><span class="js- pricing_section-price">{{price}}</span> <span class="js- pricing_section-dom">{{dom}}</span> <span class="pricing_section-details">{{{details}}}</span>
<p class="pricing_section-info">{{{text}}}</p>
          {{/if}}
        </div>
        {{#if button1}}
<button class="pricing_button js signup-button">{{../button1}}</button>
        {{/if}}
        {{#if button2}}
<button class="pricing_button -red js-quote-button" data-analytic="submit-quote">{{../button2}}</button>
        {{/if}}
      </div>
    {{/each}}
    </div>
    
  </div>
</div>
{{/with}}

<div id="quote" class="js quote">
    <div class="pricing">
        <h3 class="pricing_header">{{{header}}}</h3>
        <p class="pricing_info">{{{text}}}</p>
        <div class="js pricing_sections">
        {{#each inputs}}
            <div class="pricing_input-wrapper {{size}}">
                <label class="pricing_label">{{placeholder}}</label>
                {{#if list}}
                    <select required name="{{name}}" class="js pricing_input">
                    {{#each list}}
                        <option value="{{#if name}}{{name}}{{/if}}">{{#if name}}{{name}}{{else}}{{this}}{{/if}}</option>
                    {{/each}}
                    </select>
                {{else}}
                    <input required type="{{#if type}}{{type}}{{else}}text{{/if}}" name="{{name}}" placeholder="{{placeholder}}" class="js pricing_input" value="{{value}}">
                {{/if}}
            </div>
        {{/each}}
        </div>
        <button class="js-teacher-quote pricing_button -red" data-analytic="submit-quote-button Quote">{{{button}}}</button>
  </div>
</div>

{{else}}
            {{{level}}}
          {{/if}}
        </h2>
<h3 class="track-popup_name">{{name}}</h3>
<p class="track-popup_description">{{description}}</p>
      </div>
    </div>
<div class="track-popup_header-right">
      {{{trackBox}}}
      
      {{#if secondaryButton}}
<a href="{{trackUrl}}" class="js track-popup_header-button">{{secondaryButton}}</a>
      {{/if}}
    </div>
  </div>
<div class="js track-popup_tracks">
    {{#each courses}}
<div class="track-popup_course">
<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>
          </div>
        </div>
<div class="track-popup_course-right">
          {{{boxHtml}}}
<a href="{{url}}" class="track-popup_course-button {{#if ../disableTrack}}is-disabled{{/if}}">{{../startNowButton}}</a>
        </div>
      </div>
    {{/each}}
  </div>
</div>

<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>
</div>

<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>
    {{/if}}
<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}}
      </div>
      {{#if description}}<p class="js- projects-popup_description">{{{description}}}</p>{{/if}}
      {{#compare progress '>' 0}}
        {{#equals type project}}
<div class="projects-popup_progress-bar">
<div class="js- projects-popup_progress {{{theme}}}" style="width: {{progress}}%"></div>
          </div>
        {{/equals}}
      {{/compare}}
    </div>
  </div>
<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}}
      </div>
      {{#if description}}<p class="js- projects-popup_description">{{{description}}}</p>{{/if}}
      {{#compare progress '>' 0}}
        {{#equals type project}}
<div class="projects-popup_progress-bar">
<div class="js- projects-popup_progress {{{theme}}}" style="width: {{progress}}%"></div>
          </div>
        {{/equals}}
      {{/compare}}
    </div>
    {{#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>

{{#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}}

<!doctype html>
<style>
    html {
        font-size: 0 !important;
    }

.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>

download
new file
upload media
rename

delete

Keyboard Shortcuts

Toolbox

My Notes

Loading Notes...

<!doctype html>

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

<!doctype html>

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

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

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;
    }

h1 {
        font-size: 28px;
    }

#code {
        display: none;
    }
</style>

<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>
<iframe id="myApp" {events} width="{width}" height="{height}"></iframe>
<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!

{{ model.achievement.text }}

Abacus

Keyboard Shortcuts

Toolbox

My Notes

Loading Notes...