diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 7987028..325346f 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 one, int two){
+        return one+two;
+    }
 
 
     /*
@@ -65,6 +71,8 @@ public Exercise(int age) {
         together with a space in between.
      */
 
-
+    public String add(String one, String two){
+        return one + " " + two;
+    }
 
 }
diff --git a/src/main/java/com/booleanuk/extension/Extension.java b/src/main/java/com/booleanuk/extension/Extension.java
index 62b878f..fc97473 100644
--- a/src/main/java/com/booleanuk/extension/Extension.java
+++ b/src/main/java/com/booleanuk/extension/Extension.java
@@ -2,7 +2,50 @@
 
 import com.booleanuk.helpers.ExtensionBase;
 
+import java.sql.Array;
+
 public class Extension extends ExtensionBase {
+
+    public float add(float one, float two){
+        return one+two;
+    }
+
+    public double add(double one, double two){
+        return one+two;
+    }
+
+    public float subtract(float one, float two){
+        return one-two;
+    }
+
+    public String subtract(String str, char chr){
+        String ans = str.replace(chr, ' ');
+        return ans.replaceAll("\\s+","");
+
+    }
+
+    public int multiply(int one, int two){
+        return one*two;
+    }
+
+    public String multiply(String str, int n){
+        StringBuilder k = new StringBuilder();
+        for (int i = 0; i <= n-1; i++){
+            k.append(str);
+            if (i != n-1){
+                k.append(",");
+            }
+        }
+        return k.toString();
+    }
+
+    public int[] multiply(String[] str, int n) {
+        int[] ans = new int[3];
+        for (int i = 0; i <= str.length - 1; i++) {
+            ans[i] = Integer.parseInt(str[i]) * n;
+        }
+        return ans;
+    }
     /*
         Implement the following methods: