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..2552802 100644
--- a/src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java
+++ b/src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java
@@ -2,27 +2,68 @@
 
 
 public class NumberUtilities {
+
+
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        StringBuilder evenNumbers = new StringBuilder();
+        for (int i = start; i < stop ; i++) {
+            if(i % 2 == 0)
+            {
+                evenNumbers.append(i);
+            }
+
+        }
+
+
+        return evenNumbers.toString();
+
     }
 
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        StringBuilder builderOddNumbers = new StringBuilder();
+        for (int i = start; i < stop ; i++) {
+            if(!(i % 2 == 0))
+            {
+                builderOddNumbers.append(i);
+            }
+
+        }
+
+
+        return builderOddNumbers.toString();
+
     }
 
 
     public static String getSquareNumbers(int start, int stop, int step) {
-        return null;
+        StringBuilder squareNumbersBuilder = new StringBuilder();
+        for (int i = start; i <stop ; i = i + step) {
+            int square = i * i;
+            squareNumbersBuilder.append(square);
+        }
+        return squareNumbersBuilder.toString();
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+        StringBuilder getRangeBuilder = new StringBuilder();
+        for (int i = start; i <stop ; i = i + step) {
+
+            getRangeBuilder.append(i);
+        }
+        return getRangeBuilder.toString();
     }
 
 
     public static String getExponentiations(int start, int stop, int step, int exponent) {
-        return null;
+
+        StringBuilder exponentBuilder = new StringBuilder();
+        for (int i = start; i < stop ; i = i + step){
+            long exponentiatedValue = (long)Math.pow(i, exponent);
+            exponentBuilder.append(exponentiatedValue);
+        }
+
+        return exponentBuilder.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..525f56e 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 +2,43 @@
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        StringBuilder smallMultiBuilder = new StringBuilder();
+        for (int i = 1; i <= 5; i++) {
+
+            for (int w = 1; w <= 5; w++) {
+                int productIW = i * w;
+                smallMultiBuilder.append(String.format("%3d |", productIW));
+            }
+            smallMultiBuilder.append("\n");
+        }
+        return smallMultiBuilder.toString();
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        StringBuilder largeMultiplicationBuilder = new StringBuilder();
+        for (int i = 1; i <= 10; i++) {
+            for (int w = 1; w <= 10; w++) {
+                int productIW = i * w;
+                largeMultiplicationBuilder.append(String.format("%3d |", productIW));
+            }
+            largeMultiplicationBuilder.append("\n");
+        }
+        return largeMultiplicationBuilder.toString();
+
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        StringBuilder multiplicationBuilder = new StringBuilder();
+        for (int i = 1; i <= 20; i++) {
+
+            for (int w = 1; w <= 20; w++) {
+                int productIW = (i * w);
+                multiplicationBuilder.append(String.format("%3d |", productIW));
+
+            }
+            multiplicationBuilder.append("\n");
+
+        }
+        return multiplicationBuilder.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..5aa6862 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 +3,47 @@
 public class TriangleUtilities {
 
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder triangleBuilder = new StringBuilder();
+
+        for (int i = 1; i <= numberOfRows-1; i++) {
+            for (int w = 1; w <= i ; w++) {
+                triangleBuilder.append("*");
+            }
+            triangleBuilder.append("\n");
+        }
+
+        return triangleBuilder.toString();
     }
 
     public static String getRow(int numberOfStars) {
-        return null;
+
+        StringBuilder asteriskRowBuild = new StringBuilder();
+        for(int i = 1; i <= numberOfStars; i++) {
+            asteriskRowBuild.append("*");
+        }
+        return asteriskRowBuild.toString();
     }
 
     public static String getSmallTriangle() {
-        return null;
+
+        StringBuilder smallTriangle = new StringBuilder();
+        for (int i =1; i <= 4; i++) {
+            for (int w = 1; w <= i; w ++) {
+                smallTriangle.append("*");
+            }
+            smallTriangle.append("\n");
+        }
+        return smallTriangle.toString();
     }
 
     public static String getLargeTriangle() {
-        return null;
+        StringBuilder largeTriangle = new StringBuilder();
+        for (int i =1; i <= 9; i++) {
+            for (int w = 1; w <= i; w++) {
+                largeTriangle.append("*");
+            }
+            largeTriangle.append("\n");
+        }
+        return largeTriangle.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..9f99715 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;
 
@@ -65,10 +65,11 @@ public void testGetEvenNumbers() {
     @Test
     public void testGetOddNumbers() {
         // : Given
-        String expected = "681012141618";
+        String expected = "5791113151719";
         int start = 5;
         int stop = 20;
-        int step = 5;
+        //
+        // int step = 5;
 
         // : When
         String actual = NumberUtilities.getOddNumbers(start, stop);
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..bc3bb17 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" +
@@ -34,7 +34,7 @@ public void getTriangleTest1() {
     @Test
     public void getTriangleTest2() {
         String expected =
-                "*\n" +
+                        "*\n" +
                         "**\n" +
                         "***\n" +
                         "****\n";