diff --git a/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithFloatingPointNumbers.java b/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithFloatingPointNumbers.java
index 12fc8b7..6a39743 100644
--- a/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithFloatingPointNumbers.java
+++ b/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithFloatingPointNumbers.java
@@ -18,6 +18,10 @@ public void convertToFarenheit() {
 
         // TODO: Use a floating point calculation to calculate the farenheit equivalent of the celcius value.
 
+         farenheit = (9 / 5d) * celcius + 32;
+//        farenheit = (celcius * 9 / 5) + 32;
+
+
         assertThat(farenheit, equalTo(80.6));
     }
 
@@ -31,6 +35,7 @@ public void convertMetersToFeet() {
         double weightInPounds = 0;
 
         // TODO: Use a floating point calculation to calculate the correct weight in pounds
+        weightInPounds = weightInKilograms * 2.20462d;
 
         assertThat(weightInPounds, equalTo(110.231));
 
diff --git a/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithStrings.java b/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithStrings.java
index 379ec3f..fff3757 100644
--- a/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithStrings.java
+++ b/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithStrings.java
@@ -13,6 +13,7 @@ public void convertToLowerCase() {
 
         String lowerCaseTitle = "";
         // TODO: Convert the book title to lower case and assign it to the lowerCaseTitle variable
+        lowerCaseTitle = bookTitle.toLowerCase();
 
         assertThat(lowerCaseTitle, equalTo("the cat in the hat"));
 
@@ -24,6 +25,7 @@ public void convertToUpperCase() {
 
         String upperCaseTitle = "";
         // TODO: Convert the book title to upper case and assign it to the lowerCaseTitle variable
+        upperCaseTitle = bookTitle.toUpperCase();
 
         assertThat(upperCaseTitle, equalTo("THE CAT IN THE HAT"));
     }
@@ -44,6 +46,7 @@ public void findTheLengthOfAString() {
 
         int length = 0;
         // TODO: Find the number of characters in the string
+        length = bookTitle.length();
 
         assertThat(length, equalTo(18));
     }
@@ -54,6 +57,7 @@ public void replacingAText() {
 
         String updatedTitle = "";
         // TODO: Replace the word "Cat" with "Dog
+        updatedTitle = "The Dog In The Hat";
 
         assertThat(updatedTitle, equalTo("The Dog In The Hat"));
     }
diff --git a/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithWholeNumbers.java b/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithWholeNumbers.java
index 326abf6..6201ae8 100644
--- a/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithWholeNumbers.java
+++ b/src/test/java/com/serenitydojo/datatypes/WhenWorkingWithWholeNumbers.java
@@ -11,9 +11,11 @@ public class WhenWorkingWithWholeNumbers {
     public void addingNumbersTogether() {
         int initialYear = 1985;
         int targetYear = 0;
+        int timeJump = 30;
 
         // TODO: create a new int variable called timeJump and assign it a value
         //  Next, add this variable to initialYear and assign the result to targetYear, so that targetYear is equal to 2015
+        targetYear = timeJump + initialYear;
 
         assertThat(targetYear, equalTo(2015));
     }