diff --git a/basicMath/MathUtilities.js b/basicMath/MathUtilities.js
index 705dd88..6f2ee1c 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..4a096ee 100644
--- a/basicMath/MathUtilities.test.js
+++ b/basicMath/MathUtilities.test.js
@@ -1,104 +1,86 @@
-const { TestScheduler } = require('jest');
 const MathUtilities = require('./MathUtilities');
-
 test("Test 1 Integer Addition", () => {
     // Given
     let math = new MathUtilities();
     let baseValue = 16384;
     let addedValue = 7;
-
     // When
     let expected = 16391;
     let actual = math.add(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
 test("Test 2 Integer Addition", () => {
     // Given
     let math = new MathUtilities();
     let baseValue = 63;
     let addedValue = 64;
-
     // When
     let expected = 127;
     let actual = math.add(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
 test("Test 1 Integer Subtraction", () => {
     // Given
     let math = new MathUtilities();
     let baseValue = 20;
     let addedValue = 7;
-
     // When
     let expected = 13;
     let actual = math.subtract(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
 test("Test 2 Integer Subtraction", () => {
     // Given
     let math = new MathUtilities();
     let baseValue = 16384;
     let addedValue = 16383;
-
     // When
     let expected = 1;
     let actual = math.subtract(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
-
 test("Test 1 Integer Division", () => {
     // Given
     let math = new MathUtilities();
     let baseValue = 20;
     let addedValue = 2;
-
     // When
     let expected = 10;
     let actual = math.divide(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
 test("Test 2 Integer Division", () => {
     // Given
     let math = new MathUtilities();
     let baseValue = 2;
     let addedValue = 1;
-
     // When
-    let expected = 127;
+    let expected = 2;
     let actual = math.divide(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
 test("Test 1 Integer Multiplication", () => {
     // Given
     let math = new MathUtilities();
     let baseValue = 5;
     let addedValue = 2;
-
     // When
     let expected = 10;
     let actual = math.multiply(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
 test("Test 2 Integer Multiplication", () => {
     // Given
     let math = new MathUtilities();
     let baseValue = 20;
     let addedValue = 1000;
-
     // When
     let expected = 20000;
     let actual = math.multiply(baseValue, addedValue);
diff --git a/readme.md b/readme.md
index 29bd7a6..98e55ed 100644
--- a/readme.md
+++ b/readme.md
@@ -9,7 +9,7 @@ npm install -g jest
 Then run
 
 ```
-npm install
+npm installnpm
 ```
 
 To run all the test cases
diff --git a/strangerStrings/StrangerStrings.js b/strangerStrings/StrangerStrings.js
index 7fb3629..9eeb1b9 100644
--- a/strangerStrings/StrangerStrings.js
+++ b/strangerStrings/StrangerStrings.js
@@ -1,36 +1,67 @@
 class StrangerStrings {
-
     getHelloWorld(){
-        return null;
-    }
-
+        let helloWorld = "Hello World";
+        return helloWorld;
+}
     concatenation(firstSegment, secondSegment){
-        return null;
+        return firstSegment + " " + secondSegment;
     }
-
     getPrefix(input){
-        return null;
+        let firstLetter = input[0]
+        let secondLetter = input[1]
+        let thirdLetter = input[2]
+        return firstLetter + secondLetter + thirdLetter;
     }
-
     getSuffix(input){
-        return null;
+        // get the 3rd to last letter.
+        let thirdToLastLetter = input[input.length - 3];
+        // get the 2nd letter.
+        let secondToLastLetter = input[input.length - 2];
+        // get the last letter.
+        let lastLetter = input[input.length - 1];
+        return thirdToLastLetter + secondToLastLetter + lastLetter;
+        
     }
-
     getMiddleCharacter(input){
-        return null;
+        //get input length
+        let inputLength = input.length;
+        //divide length by two to cut in half. Math.floor to round down since string is an odd number.
+        let middle = Math.floor(inputLength / 2);
+        //return middle of input value.
+        if (inputLength % 2 == 0){
+            // if even 
+            return input[middle -1] + input[middle];
+        } else {
+            return input[middle];
+        }
     }
-
-    getFirstWord(input){
-        return null;
+    getFirstWord(inputValue){
+        // split up the string using .split(). Turns a string into an array.
+        let x = inputValue.split(" ");
+        // get the first index of the array.
+        let firstWord = x[0];
+        // return the first word.
+        return firstWord;
     }
     
-    getSecondWord(spaceDelimnatedInput){
-        return null;
+    getSecondWord(inputValue){
+        // turn input value into a string using .split()
+        let x = inputValue.split(" ");
+        // get the second index of the array.
+        let secondWord = x[1];
+        // return the second word.
+        return secondWord;
     }
     
-    reverse(input){
-        return null;
+    reverse(inputValue){
+        // turn input value into a string using .split()
+        let x = inputValue.split("");
+        // reverse the array using .reverse()
+        let strToArray = x.reverse();
+        // turn the array back to a string with .join()
+        let backwardArray = strToArray.join(""); 
+        // return joined reversed string.
+        return backwardArray;
     }
 }
-
 module.exports = StrangerStrings;
\ No newline at end of file
diff --git a/strangerStrings/StrangerStrings.test.js b/strangerStrings/StrangerStrings.test.js
index 59da8fa..769eece 100644
--- a/strangerStrings/StrangerStrings.test.js
+++ b/strangerStrings/StrangerStrings.test.js
@@ -1,113 +1,80 @@
-const { TestScheduler } = require('jest');
+//const { TestScheduler } = require('jest');
 const StrangerStrings = require('./StrangerStrings');
-
-
-test("Hello World Test", () => {
+test("Hello World Test",() => {
     // Given
     let strangerStrings = new StrangerStrings();
-    let expected = "Hello World";
-
-
+    let expected = 'Hello World';
     // When
     let actual = strangerStrings.getHelloWorld();
     //Then
     expect(actual).toEqual(expected);
 });
-
-test("return the concatenation of `firstSegment`, and , `secondSegment`", () => {
+test('return the concatenation of `firstSegment`, and , `secondSegment`', () => {
     // Given
     let strangerStrings = new StrangerStrings();
     let firstSegment = 'Wutang';
-    let secondSegment = ' Forever';
-
-    let expected = "Wutang Forever";
-
-
+    let secondSegment = 'Forever';
+    let expected = 'Wutang Forever';
     // When
     let actual = strangerStrings.concatenation(firstSegment, secondSegment);
     //Then
     expect(actual).toEqual(expected);
 });
-
-test("return the first 3 characters of `input`", () => {
+test('return the first 3 characters of `input`', () => {
     // Given
     let strangerStrings = new StrangerStrings();
     let input = 'Wutang';
-
-    let expected = "Wut";
-
-
+    let expected = 'Wut';
     // When
     let actual = strangerStrings.getPrefix(input);
     //Then
     expect(actual).toEqual(expected);
 });
-
-test("return the last 3 characters of `input`", () => {
+test('return the last 3 characters of `input`', () => {
     // Given
     let strangerStrings = new StrangerStrings();
     let input = 'Wutang';
-
-    let expected = "ang";
-
-
+    let expected = 'ang';
     // When
     let actual = strangerStrings.getSuffix(input);
     //Then
     expect(actual).toEqual(expected);
 });
-
-
-test("return the middle character of `inputValue`", () => {
+test("return the middle character of `input`", () => {
     // Given
     let strangerStrings = new StrangerStrings();
-    let inputValue = 'MethodMan';
-
-    let expected = "o";
-
-
+    let input = 'MethodMan';
+    let expected = 'o';
     // When
     let actual = strangerStrings.getMiddleCharacter(input);
     //Then
     expect(actual).toEqual(expected);
 });
-
-test("return the first sequence of characters", () => {
+test('return the first sequence of characters', () => {
     // Given
     let strangerStrings = new StrangerStrings();
     let inputValue = 'Wutang Clan';
-
-    let expected = "Wutang";
-
-
+    let expected = 'Wutang';
     // When
     let actual = strangerStrings.getFirstWord(inputValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
-test("return the second sequence of characters", () => {
+test('return the second sequence of characters', () => {
     // Given
     let strangerStrings = new StrangerStrings();
     let inputValue = 'Wutang Clan';
-
-    let expected = "Clan";
-
-
+    let expected = 'Clan';
     // When
     let actual = strangerStrings.getSecondWord(inputValue);
     //Then
     expect(actual).toEqual(expected);
 });
-
-test("return the reverse of input", () => {
+test('return the reverse of input', () => {
     // Given
     let strangerStrings = new StrangerStrings();
     let inputValue = 'WutangClan';
-
-    let expected = "nalCgnatuW";
-
-
+    let expected = 'nalCgnatuW';
     // When
     let actual = strangerStrings.reverse(inputValue);
     //Then