diff --git a/index.html b/index.html
index 063ab98..befa8b5 100644
--- a/index.html
+++ b/index.html
@@ -4,7 +4,7 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <link rel="stylesheet" href="style.css">
-  <!-- <script src="main.js"></script> -->
+  <script src="main.js"></script>
   <title>Document</title>
 </head>
 <body>
@@ -18,9 +18,9 @@
       <!-- the "onclick" event listener passes its element's "id" to the "changeOperation" function in the main.js file -->
       <button type="button" name="add" id="addition" onclick="changeOperation(this.id)">Add</button>
       <button type="button" name="subtract" id="subtraction" onclick="changeOperation(this.id)">Subtract</button>
-      <button type="button" name="multiply" id="multiplication">Multiply</button>
-      <button type="button" name="divide" id="division">Divide</button>
-      <button type="button" name="modulus" id="modulus">Modulus</button>
+      <button type="button" name="multiply" id="multiplication" onclick="changeOperation(this.id)">Multiply</button>
+      <button type="button" name="divide" id="division" onclick="changeOperation(this.id)">Divide</button>
+      <button type="button" name="modulus" id="modulus" onclick="changeOperation(this.id)">Modulus</button>
     </div>
     <br>
     <!-- this "onclick" calls the "equal" function in the main.js file -->
diff --git a/main.js b/main.js
index bf60c18..2df6e67 100644
--- a/main.js
+++ b/main.js
@@ -30,16 +30,20 @@ const subtract = (numA, numB) => {
 // These variables are already defined but that don't point to functions. It's up to you to build the functions to complete your calculator use:
 
 const multiply = (numA, numB) => {
-  // * to get a product then return it
-  // Open up the inspector tool in Chrome and select the Console tab to see what this functions is "logging out" to the console.
-  console.log(numA, numB)
+  const product = numA * numB
+  return product
+}
+
+const divide = (numA, numB) => {
+  const div = numA / numB
+  return div
 }
 
-const divide = null
-// / to get a quotient,
 
-const modulus = null
-// and % to get a remainder.
+const modulus = (numA, numB) =>{
+  const mod = numA % numB
+  return mod
+}
 
 // This function changes the "operation" variable to be equal to the "id" of the button we choose on the web page.
 const changeOperation = (chosenOperation) => {
@@ -64,11 +68,11 @@ const equals = () => {
     break;
     case "subtraction": putResultInElement(subtract(firstNum, secondNum)) 
     break;
-    case "multiplication": multiply(firstNum, secondNum) 
+    case "multiplication": putResultInElement(multiply(firstNum, secondNum)) 
     break;
-    case "division": console.log(divide(firstNum, secondNum)) 
+    case "division": putResultInElement(divide(firstNum, secondNum)) 
     break;
-    case "modulus": console.log(modulus(firstNum, secondNum)) 
+    case "modulus": putResultInElement(modulus(firstNum, secondNum)) 
     break;
     default: "Choose an operation"
   }
