diff --git a/csharp-fundamentals-loops.Main/Core.cs b/csharp-fundamentals-loops.Main/Core.cs
index 9194643..bd731b0 100644
--- a/csharp-fundamentals-loops.Main/Core.cs
+++ b/csharp-fundamentals-loops.Main/Core.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -20,32 +21,63 @@ public class Core
         public void stepOne()
         {
             // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array                        
-            throw new NotImplementedException();            
+            for (int i = 0; i<4; i++)
+            {
+                numsZeroToThree[i] = i;
+            }           
         }
 
         public void stepTwo()
         {
+            int j = 0;
             // TODO: 2. Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
-            throw new NotImplementedException();
+            for (int i = 5; i<=10; i++)
+            {
+                numsFiveToTen[j] = i;
+                j++;
+                
+            }
         }
 
         public void stepThree()
         {
+            int j = 0;
             // TODO: 3. Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
-            throw new NotImplementedException();
+            for(int i = 3; i>=0; i--)
+            {
+                countdown[j] = i;
+                j++;
+            }
 
         }
 
         public bool stepFour(int num)
         {
+            bool result = false;
             // TODO: 6. Write a for loop that checks if num is in the favouriteNumbers array            
-            throw new NotImplementedException();
+            for (int i = 0; i<favouriteNumbers.Length; i++)
+            {
+                if(favouriteNumbers[i] == num)
+                {
+                    result = true;
+                } 
+            }
+
+            return result;
         }
 
         public bool stepFive(string hobby)
         {
+            bool result = false;
             // TODO 5. Write a for loop that checks if the hobby String is in the myHobbies array
-            throw new NotImplementedException();
+            for (int i = 0; i<myHobbies.Length; i++)
+            {
+                if (myHobbies[i] == hobby)
+                {
+                    result = true;
+                }
+            }
+            return result;
         }
     }