diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 7987028..9f4b719 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -51,20 +51,28 @@ public Exercise(int age) {
         Create a constructor that accepts both a String and an int as parameters, in that order, and assign the values
         provided to the name and age members
      */
+    public Exercise (String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
 
 
 
     /*
         2. Create a method named add that accepts two integers. The method should return the numbers added together.
      */
-
+    public int add (int numOne, int numTwo) {
+        return numOne + numTwo;
+    }
 
 
     /*
         3. Create another method named add that accepts two Strings. The method should return the strings concatenated
         together with a space in between.
      */
-
+    public String add (String stringOne, String stringTwo) {
+        return stringOne + " " + stringTwo;
+    }
 
 
 }
diff --git a/src/main/java/com/booleanuk/extension/Extension.java b/src/main/java/com/booleanuk/extension/Extension.java
index 62b878f..7bd29aa 100644
--- a/src/main/java/com/booleanuk/extension/Extension.java
+++ b/src/main/java/com/booleanuk/extension/Extension.java
@@ -2,6 +2,8 @@
 
 import com.booleanuk.helpers.ExtensionBase;
 
+import java.util.ArrayList;
+
 public class Extension extends ExtensionBase {
     /*
         Implement the following methods:
@@ -25,6 +27,58 @@ public class Extension extends ExtensionBase {
         E.g.
         multiply(["2", "7", "3"], 3) -> [6, 21, 9]
      */
+    public float add(float floatOne, float floatTwo) {
+        return floatOne + floatTwo;
+    }
+
+    public double add(double doubleOne, double doubleTwo) {
+        return doubleOne + doubleTwo;
+    }
+
+    public float subtract(float floatOne, float floatTwo) {
+        return floatOne - floatTwo;
+    }
+
+    public String subtract(String string, char character) {
+        String newString = "";
+        for (char c : string.toCharArray())
+            if (c != character) {
+                newString += c;
+            }
+
+        return newString;
+    }
+
+    public int multiply(int intOne, int intTwo) {
+        return intOne * intTwo;
+    }
+
+    // 6. multiply, which accepts a string and an int, and returns a string containing the provided string
+    //        as many times as the provided int separated by a comma. E.g.
+    //        multiply("Hello", 3) -> "Hello,Hello,Hello"
+
+    public String multiply (String string, int number) {
+        String newString = "";
+
+        for (int i = 0; i < number; i++) {
+            newString += (string + ",");
+            }
+
+        return newString.substring(0,newString.length()-1);
+
+    }
+    //denna
+    public int[] multiply(String[] stringArray, int number) {
+
+        int[] intArray = new int[stringArray.length];
+
+        for (int i = 0; i < stringArray.length; i++) {
+            int parsedNumber = Integer.parseInt(stringArray[i]);
+            parsedNumber *= number;
+            intArray[i] = parsedNumber;
+        }
+        return intArray;
 
+    }
 
 }