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..35ac2c0 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 +3,63 @@
 
 public class NumberUtilities {
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        StringBuilder sb  = new StringBuilder();
+        for (int i = start; i < stop; i++) {
+            if (i % 2 == 0) {
+                sb.append(i).toString();
+            }
+        }
+        return sb.toString();
     }
 
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        StringBuilder sb  = new StringBuilder();
+        for (int i = start; i < stop; i++) {
+            if (i % 2 != 0) {
+                sb.append(i).toString();
+            }
+        }
+        return sb.toString();
     }
 
 
     public static String getSquareNumbers(int start, int stop, int step) {
-        return null;
+
+        StringBuilder sb  = new StringBuilder();
+
+        for (int i = start; i < stop; i += step) {
+            sb.append((int) Math.pow(i, 2));
+            }
+
+            return sb.toString();
+
+
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+
+        StringBuilder sb  = new StringBuilder();
+
+        for (int i = start; i < stop; i += step) {
+            sb.append(i).toString();
+        }
+
+        return sb.toString();
+
     }
 
 
+
     public static String getExponentiations(int start, int stop, int step, int exponent) {
-        return null;
+        StringBuilder sb  = new StringBuilder();
+
+        for (int i = start; i < stop; i += step) {
+            sb.append((int) Math.pow(i, exponent));
+        }
+
+        return sb.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..7c92000 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 +2,56 @@
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+
+        StringBuilder builder = new StringBuilder();
+
+        for (int row = 1; row <= 5; row++) {
+            for(int col = 1; col <=5; col++) {
+                int table = row * col;
+                builder.append(String.format("%3d |", table));
+
+            }
+
+            builder.append("\n");
+
+        }
+
+        return builder.toString();
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+
+        StringBuilder builder = new StringBuilder();
+
+        for (int row = 1; row <= 10; row++) {
+            for(int col = 1; col <=10; col++) {
+                int table = row * col;
+                builder.append(String.format("%3d |", table));
+
+            }
+
+            builder.append("\n");
+
+        }
+
+        return builder.toString();
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+
+        StringBuilder builder = new StringBuilder();
+
+        for (int row = 1; row <= tableSize; row++) {
+            for(int col = 1; col <= tableSize; col++) {
+                int table = row * col;
+                builder.append(String.format("%3d |", table));
+
+            }
+
+            builder.append("\n");
+
+        }
+
+        return builder.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..0aa8f96 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 +3,28 @@
 public class TriangleUtilities {
 
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        for (int row = 0; row < numberOfRows; row++) {
+            builder.append(getRow(row));
+        }
+        return builder.toString();
     }
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder builder = new StringBuilder();
+
+        for (int i = 0; i <= numberOfStars; i++) {
+            builder.append("*");
+        }
+        builder.append("\n");
+        return builder.toString();
     }
 
     public static String getSmallTriangle() {
-        return null;
+        return getTriangle(4);
     }
 
     public static String getLargeTriangle() {
-        return null;
+        return getTriangle(9);
     }
 }
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..5ce91f7 100644
--- a/src/test/java/io/zipcoder/microlabs/mastering_loops/NumberUtilitiesTest.java
+++ b/src/test/java/io/zipcoder/microlabs/mastering_loops/NumberUtilitiesTest.java
@@ -51,7 +51,7 @@ public void testGetRange2() {
     @Test
     public void testGetEvenNumbers() {
         // : Given
-        String expected = "5791113151719";
+        String expected = "681012141618";
         int start = 5;
         int stop = 20;
 
@@ -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;
diff --git a/src/test/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilitiesTest.java b/src/test/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilitiesTest.java
index 47846c2..7633a52 100644
--- a/src/test/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilitiesTest.java
+++ b/src/test/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilitiesTest.java
@@ -18,7 +18,7 @@ public void getRow() {
     @Test
     public void getTriangleTest1() {
         String expected =
-                "*\n" +
+                        "*\n" +
                         "**\n" +
                         "***\n" +
                         "****\n" +
@@ -27,7 +27,7 @@ public void getTriangleTest1() {
                         "*******\n" +
                         "********\n" +
                         "*********\n";
-        String actual = TriangleUtilities.getTriangle(10);
+        String actual = TriangleUtilities.getTriangle(9);
         Assert.assertEquals(expected, actual);
     }