final. thanks.

src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java

@@ -2,27 +2,57 @@
 
 
 public class NumberUtilities {
+
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        StringBuilder evens = new StringBuilder();
+        for (int i = start; i <stop; i++) {
+            if (i % 2 == 0) {
+                evens.append(i);
+            }
+        }
+
+        return evens.toString();
     }
 
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        StringBuilder odds = new StringBuilder();
+        for (int i = start; i <stop; i++) {
+            if (i % 2 == 1) {
+                odds.append(i);
+            }
+        }
+
+        return odds.toString();
     }
 
 
     public static String getSquareNumbers(int start, int stop, int step) {
-        return null;
+        StringBuilder getSquares = new StringBuilder();
+        for (int i = start; i < stop; i+=step){
+            getSquares.append((int) Math.pow(i,2));
+        }
+
+        return getSquares.toString();
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+        StringBuilder myRange = new StringBuilder();
+        for (int i = start; i < stop; i+=step){
+            myRange.append(i);
+        }
+
+        return myRange.toString();
     }
 
 
     public static String getExponentiations(int start, int stop, int step, int exponent) {
-        return null;
+        StringBuilder myExponents = new StringBuilder();
+        for (int i = start; i<stop; i+=step){
+            myExponents.append((int) Math.pow(i,exponent));
+        }
+
+        return myExponents.toString();
     }
 }

src/main/java/io/zipcoder/microlabs/mastering_loops/TableUtilities.java

@@ -2,14 +2,47 @@
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        String myTable = "";
+
+        for (int row =1; row <=5; row++){
+            for (int col=1; col<=5; col++){
+
+                int checkSpace = col*row;
+                if (checkSpace < 10) {
+                    myTable += " " + checkSpace + " | ";
+                } else if (checkSpace >= 10){
+                    myTable += " " + checkSpace + " | ";
+                }
+
+            }
+            myTable += "\n";
+        }
+
+        return myTable;
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        StringBuilder getLarge = new StringBuilder();
+        for (int row=1; row <11 ; row++){
+            for (int col=1; col<11; col++){
+                getLarge.append(col*row + " | ");
+            }
+           getLarge.append("\n");
+
+        }
+
+        return getLarge.toString();
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        StringBuilder getMult = new StringBuilder();
+        for (int row = 1; row <= tableSize; row++){
+            for (int col = 1; col <= tableSize; col++){
+                getMult.append(row * col + " | ");
+            }
+            getMult.append("\n");
+        }
+
+        return getMult.toString();
     }
 }

src/main/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilities.java

@@ -3,18 +3,49 @@
 public class TriangleUtilities {
 
     public static String getTriangle(int numberOfRows) {
-        return null;
+
+        StringBuilder myTri = new StringBuilder();
+        for (int i = 1; i < numberOfRows; i++) {
+            for (int j = 0; j < i; j++) {
+                myTri.append("*");
+            }
+                myTri.append("\n");
+        }
+
+        return myTri.toString();
     }
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder newRow = new StringBuilder();
+        for (int i = 0; i < numberOfStars; i++){
+            newRow.append("*");
+        }
+        return newRow.toString();
     }
 
     public static String getSmallTriangle() {
-        return null;
+        StringBuilder smallTri = new StringBuilder();
+        for (int i = 1; i < 5; i++) {
+            for (int j = 0; j < i; j++) {
+                smallTri.append("*");
+            }
+            smallTri.append("\n");
+        }
+
+        return smallTri.toString();
     }
 
     public static String getLargeTriangle() {
-        return null;
+
+        StringBuilder largeTri = new StringBuilder();
+        for (int i = 1; i < 10; i++) {
+            for (int j = 0; j < i; j++) {
+                largeTri.append("*");
+            }
+            largeTri.append("\n");
+        }
+
+        return largeTri.toString();
+    }
     }
-}
+

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 +65,10 @@ public void testGetEvenNumbers() {
     @Test
     public void testGetOddNumbers() {
         // : Given
-        String expected = "681012141618";
+        String expected = "5791113151719";
         int start = 5;
         int stop = 20;
-        int step = 5;
+
 
         // : When
         String actual = NumberUtilities.getOddNumbers(start, stop);