diff --git a/src/main/java/io/zipcoder/microlabs/mastering_loops/MainApp.java b/src/main/java/io/zipcoder/microlabs/mastering_loops/MainApp.java
index 29e339b..08ada4a 100644
--- a/src/main/java/io/zipcoder/microlabs/mastering_loops/MainApp.java
+++ b/src/main/java/io/zipcoder/microlabs/mastering_loops/MainApp.java
@@ -5,7 +5,11 @@
 /**
  * Created by leon on 1/31/18.
  */
+
+// saved
 public class MainApp {
     public static void main(String[] args) {
+
+
     }
 }
diff --git a/src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java b/src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java
index 5a742c4..4f03aff 100644
--- a/src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java
+++ b/src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java
@@ -3,26 +3,73 @@
 
 public class NumberUtilities {
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+
+        for (int i = start; i < stop; i += 2) {
+            myString.append(i);
+        }
+
+        return myString.toString();
+
+
     }
 
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+
+        for (int i = start; i < stop; i += 2) {
+            myString.append(i);
+        }
+
+        return myString.toString();
+
     }
 
 
     public static String getSquareNumbers(int start, int stop, int step) {
-        return null;
+
+
+        StringBuilder myString = new StringBuilder();
+
+
+        for (int i = start; i < stop; i += step) {
+            myString.append(i * i);
+
+        }
+
+        return myString.toString();
+
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+        for (int i = start; i < stop; i += step) {
+            myString.append(i);
+        }
+
+        return myString.toString();
     }
 
 
     public static String getExponentiations(int start, int stop, int step, int exponent) {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+
+        for (int i = start; i < stop; i += step) {
+            myString.append((long)(Math.pow(i, 2)));
+
+        }
+
+        return myString.toString();
+
     }
 }
diff --git a/src/main/java/io/zipcoder/microlabs/mastering_loops/TableUtilities.java b/src/main/java/io/zipcoder/microlabs/mastering_loops/TableUtilities.java
index e27a826..aa4ed1c 100644
--- a/src/main/java/io/zipcoder/microlabs/mastering_loops/TableUtilities.java
+++ b/src/main/java/io/zipcoder/microlabs/mastering_loops/TableUtilities.java
@@ -2,14 +2,63 @@
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+        for (int i = 1; i < 6; i++) {
+
+            for (int j = 1; j < 6; j++) {
+
+                myString.append(String.format("%3d |", i * j));
+
+
+            }
+
+            myString.append("\n");
+
+        }
+
+        return myString.toString();
+
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+
+            StringBuilder myString = new StringBuilder();
+
+            for (int i = 1; i < 11; i++) {
+
+                for (int j = 1; j < 11; j++) {
+
+                    myString.append(String.format("%3d |", i*j));
+
+                }
+
+                myString.append("\n");
+
+            }
+
+            return myString.toString();
+
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+        for (int i = 1; i <= tableSize; i++) {
+
+            for (int j = 1; j <= tableSize; j++) {
+
+                myString.append(String.format("%3d |", i*j));
+
+            }
+
+            myString.append("\n");
+
+        }
+
+        return myString.toString();
+
     }
 }
diff --git a/src/main/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilities.java b/src/main/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilities.java
index 0c7cd35..28ab9e0 100644
--- a/src/main/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilities.java
+++ b/src/main/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilities.java
@@ -3,18 +3,65 @@
 public class TriangleUtilities {
 
     public static String getTriangle(int numberOfRows) {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+        for (int i = 1; i < numberOfRows; i++) {
+
+            for (int j = 0; j < i; j++) {
+                myString.append("*");
+
+            }
+            myString.append("\n");
+        }
+
+        return myString.toString();
     }
 
     public static String getRow(int numberOfStars) {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+        for (int i = 0; i < numberOfStars; i++) {
+            myString.append("*");
+        }
+
+        return myString.toString();
+
     }
 
     public static String getSmallTriangle() {
-        return null;
+
+        StringBuilder myString = new StringBuilder();
+
+        for (int i = 0; i <= 3; i++) {
+
+            for (int j = 0; j < i; j++) {
+                myString.append("*");
+
+            }
+            myString.append("*\n");
+
+        }
+
+        return myString.toString();
     }
 
     public static String getLargeTriangle() {
-        return null;
+
+       StringBuilder myString = new StringBuilder();
+
+       for (int i = 0; i <= 8; i++) {
+
+           for (int j = 0; j < i; j++) {
+               myString.append("*");
+           }
+
+           myString.append("*\n");
+
+       }
+
+       return myString.toString();
+
     }
 }
diff --git a/src/test/java/io/zipcoder/microlabs/mastering_loops/NumberUtilitiesTest.java b/src/test/java/io/zipcoder/microlabs/mastering_loops/NumberUtilitiesTest.java
index e579b43..2feade3 100644
--- a/src/test/java/io/zipcoder/microlabs/mastering_loops/NumberUtilitiesTest.java
+++ b/src/test/java/io/zipcoder/microlabs/mastering_loops/NumberUtilitiesTest.java
@@ -65,7 +65,7 @@ public void testGetEvenNumbers() {
     @Test
     public void testGetOddNumbers() {
         // : Given
-        String expected = "681012141618";
+        String expected = "5791113151719";
         int start = 5;
         int stop = 20;
         int step = 5;