diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 7987028..c419841 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -51,20 +51,24 @@ 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..9e08313 100644
--- a/src/main/java/com/booleanuk/extension/Extension.java
+++ b/src/main/java/com/booleanuk/extension/Extension.java
@@ -1,5 +1,6 @@
 package com.booleanuk.extension;
 
+import com.booleanuk.core.Exercise;
 import com.booleanuk.helpers.ExtensionBase;
 
 public class Extension extends ExtensionBase {
@@ -25,6 +26,42 @@ 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 stringOne, char charOne) {
+        return stringOne.replace(String.valueOf(charOne), "");
+    }
+
+    public int multiply(int numOne, int numTwo) {
+        return numOne * numTwo;
+    }
+
+    public String multiply(String stringOne, int times) {
+        String out = stringOne;
+        for (int i = 0; i < times - 1; i++) {
+            out += "," + stringOne;
+        }
+        return out;
+    }
+
+    public int[] multiply(String[] list, int num) {
+        int[] numList = new int[list.length];
+        int calculatedNum = 0;
+        for (int i = 0; i < list.length; i++) {
+            calculatedNum = Integer.parseInt(list[i]) * num;
+            numList[i] = calculatedNum;
+        }
+        return numList;
+    }
 
 }