diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 7987028..4ec8750 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -51,20 +51,22 @@ 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;
+    }
 
 
     /*
         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 one, String two) {
+        return one + " " + two;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/booleanuk/extension/Extension.java b/src/main/java/com/booleanuk/extension/Extension.java
index 62b878f..04808fc 100644
--- a/src/main/java/com/booleanuk/extension/Extension.java
+++ b/src/main/java/com/booleanuk/extension/Extension.java
@@ -25,6 +25,47 @@ public class Extension extends ExtensionBase {
         E.g.
         multiply(["2", "7", "3"], 3) -> [6, 21, 9]
      */
+    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 letter) {
+        String newStr = "";
+        for(int i = 0; i < str.length(); i++) {
+            if(str.charAt(i) != letter) {
+                newStr += str.charAt(i);
+            }
+        }
+        return newStr;
+    }
+
+    public int multiply(int one, int two) {
+        return one * two;
+    }
+
+    public String multiply(String str, int num) {
+        String newStr = "";
+        for(int i = 0; i < num; i++) {
+            newStr += str;
+            if(i != num - 1)
+                newStr += ",";
+        }
+        return newStr;
+    }
+
+    public int[] multiply(String[] num, int acc) {
+        int[] newNums = new int[num.length];
+        for(int i = 0; i < num.length; i++) {
+            newNums[i] = Integer.parseInt(num[i]) * acc;
+        }
+        return newNums;
+    }
+}
\ No newline at end of file