diff --git a/SpecRunner.html b/SpecRunner.html
index 0265dc18..f93f39a8 100644
--- a/SpecRunner.html
+++ b/SpecRunner.html
@@ -1,25 +1,27 @@
 <!DOCTYPE html>
 <html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Jasmine Spec Runner v2.8.0</title>
 
-    <link rel="shortcut icon" type="image/png" href="jasmine/jasmine-2.8.0/jasmine_favicon.png" />
-    <link rel="stylesheet" href="jasmine/jasmine-2.8.0/jasmine.css" />
+<head>
+  <meta charset="utf-8" />
+  <title>Jasmine Spec Runner v2.8.0</title>
 
-    <script src="jasmine/jasmine-2.8.0/jasmine.js"></script>
-    <script src="jasmine/jasmine-2.8.0/jasmine-html.js"></script>
-    <script src="jasmine/jasmine-2.8.0/boot.js"></script>
+  <link rel="shortcut icon" type="image/png" href="jasmine/jasmine-2.8.0/jasmine_favicon.png" />
+  <link rel="stylesheet" href="jasmine/jasmine-2.8.0/jasmine.css" />
 
-    <!--  Iterations 1 - 8 -->    
-    <script src="src/chronometer.js"></script>
-    <script src="tests/chronometer.spec.js"></script>
+  <script src="jasmine/jasmine-2.8.0/jasmine.js"></script>
+  <script src="jasmine/jasmine-2.8.0/jasmine-html.js"></script>
+  <script src="jasmine/jasmine-2.8.0/boot.js"></script>
 
-    <!-- Bonus Iteration 9: Centiseconds -->
-    <!-- <script src="src/chronometer-centiseconds.js"></script> -->
-    <!-- <script src="tests/chronometer-centiseconds.spec.js"></script> -->
+  <!--  Iterations 1 - 8 -->
+  <!-- <script src="src/chronometer.js"></script>
+    <script src="tests/chronometer.spec.js"></script>-->
 
-  </head>
+  <!-- Bonus Iteration 9: Centiseconds -->
+  <script src="src/chronometer-centiseconds.js"></script>
+  <script src="tests/chronometer-centiseconds.spec.js"></script>
 
-  <body></body>
-</html>
+</head>
+
+<body></body>
+
+</html>
\ No newline at end of file
diff --git a/index.html b/index.html
index 32e914c7..7959df84 100644
--- a/index.html
+++ b/index.html
@@ -1,5 +1,6 @@
 <!DOCTYPE html>
 <html lang="en">
+
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
@@ -7,6 +8,7 @@
   <title>JS Chronometer</title>
   <link rel="stylesheet" href="styles/style.css">
 </head>
+
 <body>
 
   <section id="splits-container">
@@ -19,7 +21,8 @@ <h3>Splits</h3>
 
   <section id="clock">
     <div id="sphere">
-      <span id="minDec" class="number">0</span><span id="minUni" class="number">0</span><span>:</span><span id="secDec" class="number">0</span><span id="secUni" class="number">0</span>
+      <span id="minDec" class="number">0</span><span id="minUni" class="number">0</span><span>:</span><span id="secDec"
+        class="number">0</span><span id="secUni" class="number">0</span>
 
       <div id="centiseconds">
         <span id="centisecDec">0</span><span id="centisecUni">0</span>
@@ -38,13 +41,14 @@ <h3>Splits</h3>
 
 
   <!--  Iterations 1 - 8 -->
-  <script src="src/chronometer.js"></script>
+  <!--<script src="src/chronometer.js"></script>-->
 
   <!-- Bonus Iteration 9: Centiseconds -->
-  <!-- <script src="src/chronometer-centiseconds.js"></script> -->
+  <script src="src/chronometer-centiseconds.js"></script>
+
 
-  
   <!--  DOM manipulation logic -->
   <script src="src/index.js"></script>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/src/chronometer-centiseconds.js b/src/chronometer-centiseconds.js
index 8337b5b6..b9c8db30 100644
--- a/src/chronometer-centiseconds.js
+++ b/src/chronometer-centiseconds.js
@@ -1,37 +1,63 @@
 class Chronometer {
   constructor() {
     // ... your code goes here
+    this.currentTime = 0;
+    this.intervalId = null;
   }
 
   start(printTimeCallback) {
     // ... your code goes here
+    this.intervalId = setInterval(() => {
+      this.currentTime += 1;
+      if (printTimeCallback) {
+        printTimeCallback();
+      }
+    }, 10);
   }
 
   getMinutes() {
     // ... your code goes here
+    const minutes = Math.floor(this.currentTime / 6000);
+    return minutes;
   }
 
   getSeconds() {
     // ... your code goes here
+    const seconds = Math.floor((this.currentTime / 100) % 60);
+    return seconds;
   }
 
   getCentiseconds() {
     // ... your code goes here
+    const centiseconds = Math.floor(this.currentTime % 100);
+    return centiseconds;
   }
 
   computeTwoDigitNumber(value) {
     // ... your code goes here
+    if (value.toString().length < 2) {
+      return `0${value}`;
+    } else {
+      return value.toString();
+    }
   }
 
   stop() {
     // ... your code goes here
+    clearInterval(this.intervalId);
   }
 
   reset() {
     // ... your code goes here
+    this.currentTime = 0;
   }
 
   split() {
     // ... your code goes here
+    const minutes = this.computeTwoDigitNumber(this.getMinutes());
+    const seconds = this.computeTwoDigitNumber(this.getSeconds());
+    const centiseconds = this.computeTwoDigitNumber(this.getCentiseconds());
+
+    return `${minutes}:${seconds}.${centiseconds}`;
   }
 }
diff --git a/src/chronometer.js b/src/chronometer.js
index 83c75bd2..a833512d 100644
--- a/src/chronometer.js
+++ b/src/chronometer.js
@@ -1,33 +1,53 @@
 class Chronometer {
   constructor() {
     // ... your code goes here
+    this.currentTime = 0;
+    this.intervalId = null;
   }
 
   start(printTimeCallback) {
     // ... your code goes here
+    this.intervalId = setInterval(() => {
+      this.currentTime += 1;
+      if (printTimeCallback) {
+        printTimeCallback();
+      }
+    }, 1000);
   }
 
   getMinutes() {
     // ... your code goes here
+    return Math.floor(this.currentTime / 60);
   }
 
   getSeconds() {
     // ... your code goes here
+    return Math.floor(this.currentTime % 60);
   }
 
   computeTwoDigitNumber(value) {
     // ... your code goes here
+    if (value.toString().length < 2) {
+      return `0${value}`;
+    } else {
+      return value.toString();
+    }
   }
 
   stop() {
     // ... your code goes here
+    clearInterval(this.intervalId);
   }
 
   reset() {
     // ... your code goes here
+    this.currentTime = 0;
   }
 
   split() {
     // ... your code goes here
+    const minutes = this.computeTwoDigitNumber(this.getMinutes());
+    const seconds = this.computeTwoDigitNumber(this.getSeconds());
+    return `${minutes}:${seconds}`;
   }
 }
