diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 7987028..578de0c 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -51,13 +51,19 @@ 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 int1, int int2) {
+        return int1 + int2;
+    }
 
 
     /*
@@ -65,6 +71,8 @@ public Exercise(int age) {
         together with a space in between.
      */
 
-
+    public String add(String string1, String string2) {
+        return string1 + " " + string2;
+    }
 
 }
diff --git a/src/main/java/com/booleanuk/extension/Extension.java b/src/main/java/com/booleanuk/extension/Extension.java
index 62b878f..06d226f 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:
@@ -26,5 +28,46 @@ public class Extension extends ExtensionBase {
         multiply(["2", "7", "3"], 3) -> [6, 21, 9]
      */
 
+    public float add(float float1, float float2) {
+        return float1 + float2;
+    }
+
+
+    public double add(double double1, double double2) {
+        return double1 + double2;
+    }
+
+
+    public float subtract(float float1, float float2) {
+        return float1 - float2;
+    }
+
+
+    public String subtract(String string, char character) {
+        return string.replace(String.valueOf(character), "");
+    }
+
+
+    public int multiply(int int1, int int2) {
+        return int1 * int2;
+    }
+
+
+    public String multiply(String string, int number) {
+        String output = string;
+        while (number - 1 != 0) {
+            number--;
+            output += "," + string;
+        }
+        return output;
+    }
+
 
+    public int[] multiply(String[] strings, int number) {
+        int[] results = new int[strings.length];
+        for (int i = 0; i < strings.length; i++) {
+            results[i] = Integer.parseInt(strings[i]) * number;
+        }
+        return results;
+    }
 }