diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 7987028..d3c3ff1 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 x1, int x2){
+        return x1+x2;
+    }
 
 
     /*
         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 s1, String s2){
+        return s1+" "+s2;
+    }
 
 
 }
diff --git a/src/main/java/com/booleanuk/extension/Extension.java b/src/main/java/com/booleanuk/extension/Extension.java
index 62b878f..ce4a8ce 100644
--- a/src/main/java/com/booleanuk/extension/Extension.java
+++ b/src/main/java/com/booleanuk/extension/Extension.java
@@ -25,6 +25,51 @@ public class Extension extends ExtensionBase {
         E.g.
         multiply(["2", "7", "3"], 3) -> [6, 21, 9]
      */
+    public float add(float x1, float x2){
+        return x1+x2;
+    }
 
+    public double add(double x1, double x2){
+        return x1+x2;
+    }
 
+    public float subtract(float x1, float x2){
+        return x1-x2;
+    }
+
+    public String subtract(String string, char character){
+        String retStr = "";
+        for(int i = 0; i < string.length(); i++){
+            char curr = string.charAt(i);
+            if(curr != character){
+                retStr += curr;
+            }
+        }
+        return retStr;
+    }
+
+    public int multiply(int x1, int x2){
+        return x1*x2;
+    }
+
+    public String multiply(String str, int num) {
+        String retStr = "";
+        for(int i = 0; i < num; i++) {
+            retStr += str;
+
+            if(i != num-1){
+                retStr += ",";
+            }
+        }
+        return retStr;
+    }
+
+    public int[] multiply(String[] strs, int mul){
+        int strLen = strs.length;
+        int[] retNums = new int[strLen];
+        for(int i = 0; i < strLen; i++){
+            retNums[i] = Integer.parseInt(strs[i])*mul;
+        }
+        return retNums;
+    }
 }