diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..a05934a
Binary files /dev/null and b/.DS_Store differ
diff --git a/basicMath/MathUtilities.js b/basicMath/MathUtilities.js
index 705dd88..5cdc657 100644
--- a/basicMath/MathUtilities.js
+++ b/basicMath/MathUtilities.js
@@ -2,19 +2,19 @@ class MathUtilities {
 
 
     add(baseValue, valueToAdd){
-        return -1;
+        return baseValue + valueToAdd;
     }
 
     subtract(baseValue, valueToAdd){
-        return -1;
+        return baseValue - valueToAdd;
     }
 
     divide(baseValue, valueToAdd){
-        return -1;
+        return baseValue / valueToAdd;
     }
 
     multiply(baseValue, valueToAdd){
-        return -1;
+        return baseValue * valueToAdd;
     }
 }
 
diff --git a/basicMath/MathUtilities.test.js b/basicMath/MathUtilities.test.js
index 2d37cf1..d2d33a1 100644
--- a/basicMath/MathUtilities.test.js
+++ b/basicMath/MathUtilities.test.js
@@ -1,4 +1,4 @@
-const { TestScheduler } = require('jest');
+//const { TestScheduler } = require('jest');
 const MathUtilities = require('./MathUtilities');
 
 test("Test 1 Integer Addition", () => {
@@ -74,7 +74,7 @@ test("Test 2 Integer Division", () => {
     let addedValue = 1;
 
     // When
-    let expected = 127;
+    let expected = 2;
     let actual = math.divide(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);
diff --git a/strangerStrings/StrangerStrings.js b/strangerStrings/StrangerStrings.js
index 7fb3629..7e5f213 100644
--- a/strangerStrings/StrangerStrings.js
+++ b/strangerStrings/StrangerStrings.js
@@ -1,36 +1,54 @@
 class StrangerStrings {
 
     getHelloWorld(){
-        return null;
+        return "Hello World";
     }
 
     concatenation(firstSegment, secondSegment){
-        return null;
+        return firstSegment + secondSegment;
     }
 
     getPrefix(input){
-        return null;
+        let string = "";
+        string += input[0];
+        string += input[1];
+        string += input[2];
+        return string;
+
     }
 
     getSuffix(input){
-        return null;
+        let string = "";
+        string += input[input.length - 3];
+        string += input[input.length - 2];
+        string += input[input.length - 1];
+        return string;
     }
 
     getMiddleCharacter(input){
-        return null;
+        let middle = Math.floor(input.length/2);
+        if (input.length % 2 === 0) {
+            return input[middle-1] + input[middle];
+            }else {
+            return input[middle];
+        }
     }
 
     getFirstWord(input){
-        return null;
+        return input.split(" ")[0];
     }
     
     getSecondWord(spaceDelimnatedInput){
-        return null;
+        return spaceDelimnatedInput.split(" ")[1];
     }
     
     reverse(input){
-        return null;
+        let splitString = input.split("");
+        let reverseArray = splitString.reverse();
+        let joinArray = reverseArray.join("");
+        return joinArray;
     }
 }
 
-module.exports = StrangerStrings;
\ No newline at end of file
+module.exports = StrangerStrings;
+
diff --git a/strangerStrings/StrangerStrings.test.js b/strangerStrings/StrangerStrings.test.js
index 59da8fa..c452126 100644
--- a/strangerStrings/StrangerStrings.test.js
+++ b/strangerStrings/StrangerStrings.test.js
@@ -1,4 +1,4 @@
-const { TestScheduler } = require('jest');
+//const { TestScheduler } = require('jest');
 const StrangerStrings = require('./StrangerStrings');
 
 
@@ -67,7 +67,7 @@ test("return the middle character of `inputValue`", () => {
 
 
     // When
-    let actual = strangerStrings.getMiddleCharacter(input);
+    let actual = strangerStrings.getMiddleCharacter(inputValue);
     //Then
     expect(actual).toEqual(expected);
 });