diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..c14c46ebb 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1,10 @@
-console.log("Hello world");
+var greeting = "How are you today?";
+
+
+console.log("Hello world,", " My name is Jon,", "How are you today?");
+
+console.log(36);
+
+console.log(greeting);
+console.log(greeting);
+console.log(greeting);
\ No newline at end of file
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..fd47b4fad 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,5 @@
 // Start by creating a variable `greeting`
-
+const greeting = "Hello World";
+console.log(greeting);
+console.log(greeting);
 console.log(greeting);
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..8527e9867 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,5 @@
 // Start by creating a variable `message`
-
+const message = "This is a string";
+const messageType = typeof message;
 console.log(message);
+console.log(messageType);
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..a6a09954e 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
+let greetingStart = "Hello, my name is ";
+let name = "Jon";
 
-console.log(message);
+let greeting = greetingStart + name;
+console.log(greeting);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..2a466b439 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,7 @@
 // Start by creating a variable `message`
+const name = "Jon";
+let nameLength = name.length;
+let greeting = "My name is, " + name + " and my name is " + nameLength + " characters long";
+
+console.log(greeting);
 
-console.log(message);
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..63ff6d735 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,3 @@
 const name = " Daniel  ";
-
-console.log(message);
+const nameTrim = name.trim();
+console.log(nameTrim);
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..d54407667 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,10 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+let numberOfStudents = 15;
+let numberOfMentors = 8;
+let totalNumber = numberOfStudents + numberOfMentors;
+let message = "Total number of students and mentors: " + totalNumber;
+
+console.log(numberOfStudents);
+console.log(numberOfMentors);
+console.log(message);
+
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..4da8a80ea 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,17 @@
-var numberOfStudents = 15;
-var numberOfMentors = 8;
+let numberOfStudents = 15;
+let numberOfMentors = 8;
+
+// total of students and mentors
+let total = numberOfStudents + numberOfMentors;
+
+// Get percentage of students and mentors
+let studentsConvert = numberOfStudents / total * 100;
+let mentorsConvert = numberOfMentors / total * 100;
+
+// round the figure
+let percentageOfStudents = Math.round(studentsConvert);
+let percentageOfMentors = Math.round(mentorsConvert);
+
+// console log
+console.log(`Percentage of Students: ${percentageOfStudents}%`);
+console.log(`Percentage of Mentors: ${percentageOfMentors}%`);
\ No newline at end of file
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..ec4825b45 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,7 +1,12 @@
 function halve(number) {
   // complete the function here
+  return number / 2
 }
 
 var result = halve(12);
+var result = halve(100);
+var result = halve(10);
+
 
 console.log(result);
+
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..d29e195d9 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,5 +1,6 @@
 function triple(number) {
   // complete function here
+  return number * 3
 }
 
 var result = triple(12);
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..a4eed9d76 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,6 +1,7 @@
 // Complete the function so that it takes input parameters
-function multiply() {
+function multiply(num1, num2) {
   // Calculate the result of the function and return it
+  return num1 * num2;
 }
 
 // Assign the result of calling the function the variable `result`
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..d6e59c517 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,5 +1,7 @@
 // Declare your function first
-
+function divide(num1, num2) {
+    return num1 / num2;
+}
 var result = divide(3, 4);
 
 console.log(result);
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..5865ea946 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,8 @@
 // Write your function here
+function greeting(name) {
+    return `Hello my name is ${name}`;
+}
 
-var greeting = createGreeting("Daniel");
+var greeting1 = greeting("Daniel");
 
-console.log(greeting);
+console.log(greeting1);
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..4d9d1db7d 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,8 @@
 // Declare your function first
+function add(num1, num2) {
+    return num1 + num2;
+}
 
 // Call the function and assign to a variable `sum`
-
+var sum = add (13, 124);
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..1d07add45 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,4 +1,7 @@
 // Declare your function here
+function createLongGreeting(name, age) {
+    return `Hello my name is ${name} and I am ${age} years old`
+}
 
 const greeting = createLongGreeting("Daniel", 30);
 
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..88d70c310 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -1,5 +1,38 @@
+// exercise one
+function groupPercentage(num1, num2){
+    let groupTotal = num1 + num2;    
+    return calculatePercentage = Math.round((num1 / groupTotal) * 100);
+}
+
+function message(numberOfStudents, numberOfMentors){
+    let percentageOfStudents = groupPercentage(numberOfStudents, numberOfMentors);
+    let percentageOfMentors = groupPercentage (numberOfMentors, numberOfStudents);
+    return displayPercentage = `Percentage students: ${percentageOfStudents}%\nPercentage students: ${percentageOfMentors}%`;
+}
+ let percentage = message(15, 8);
+ console.log(percentage);
+
+//  exercise 2
+
 var mentor1 = "Daniel";
 var mentor2 = "Irina";
 var mentor3 = "Mimi";
 var mentor4 = "Rob";
 var mentor5 = "Yohannes";
+
+function shout(mentor) {
+    let capNames = mentor.toUpperCase();
+    return greeting = `HELLO ${capNames}`;
+}
+
+let firstGreeting = shout(mentor1);
+let secondGreeting = shout(mentor2);
+let thirdGreeting = shout(mentor3);
+let fourthGreeting = shout(mentor4);
+let fifthGreeting = shout(mentor5);
+
+console.log(firstGreeting);
+console.log(secondGreeting);
+console.log(thirdGreeting);
+console.log(fourthGreeting);
+console.log(fifthGreeting);
\ No newline at end of file
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index 70a2fe863..067197030 100644
--- a/extra/1-currency-conversion.js
+++ b/extra/1-currency-conversion.js
@@ -5,7 +5,13 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(inPounds) {
+  return inPounds * 1.4;
+}
+
+let value = convertToUSD(32);
+
+console.log(`The amount is $${value}`);
 
 /*
   CURRENCY FORMATTING
@@ -15,7 +21,14 @@ function convertToUSD() {}
   They have also decided that they should add a 1% fee to all foreign transactions, which means you only convert 99% of the £ to BRL.
 */
 
-function convertToBRL() {}
+function convertToBRL(inPounds) {
+  let fee = inPounds - (0.01 * inPounds);
+  return Math.round((fee * 5.7)* 100)/100;
+}
+
+let newValue = convertToBRL(30);
+
+console.log(`Amount is ${newValue} Brazilian real`);
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/2-piping.js b/extra/2-piping.js
index 067dd0f5b..ab0d2f463 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,16 +16,16 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(num1, num2) {
+   return num1 + num2;
 }
 
-function multiply() {
-
+function multiply(num1, num2) {
+    return num1 * num2;
 }
 
-function format() {
-
+function format(toString) {
+    return `£${toString}`;
 }
 
 const startingValue = 2
diff --git a/extra/3-magic-8-ball.js b/extra/3-magic-8-ball.js
index e32182cfe..d43002795 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -43,6 +43,29 @@
     Very doubtful.
 */
 
+let answers = [
+  posisibility: "It is certain", type: "very positive"
+  posisibility: "It is certain", type: "very positive"
+  posisibility: "It is certain", type: "very positive"
+  posisibility: "It is certain", type: "very positive"
+  posisibility: "It is certain", type: "very positive"
+  posisibility: "It is certain", type: "positive"
+  posisibility: "It is certain", type: "positive"
+  posisibility: "It is certain", type: "positive"
+  posisibility: "It is certain", type: "positive"
+  posisibility: "It is certain", type: "positive"
+  posisibility: "It is certain", type: "negative"
+  posisibility: "It is certain", type: "negative"
+  posisibility: "It is certain", type: "negative"
+  posisibility: "It is certain", type: "negative"
+  posisibility: "It is certain", type: "negative"
+  posisibility: "It is certain", type: "very negative"
+  posisibility: "It is certain", type: "very negative"
+  posisibility: "It is certain", type: "very negative"
+  posisibility: "It is certain", type: "very negative"
+  posisibility: "It is certain", type: "very negative"
+]
+
 // This should log "The ball has shaken!"
 // and return the answer.
 function shakeBall() {
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index 0a21afd1b..ae8d15e1a 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,16 +1,19 @@
 // There are syntax errors in this code - can you fix it to pass the tests?
 
-function addNumbers(a b c) {
+function addNumbers(a, b, c) {
     return a + b + c;
 }
 
-function introduceMe(name, age)
-return "Hello, my name is " + name "and I am " age + "years old";
+// 
+function introduceMe(name, age){
+
+    return "Hello, my name is " + name + " and I am " + age + " years old";
+}
 
 function getTotal(a, b) {
-    total = a ++ b;
+    total = a + b;
 
-    return "The total is total"
+    return `The total is ${total}`;
 }
 
 /* 
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 3c578ad87..42de9e9a2 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,15 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
 function trimWord(word) {
-  return wordtrim();
+  return word.trim();
 }
 
 function getWordLength(word) {
-  return "word".length();
+  return word.length;
 }
 
 function multiply(a, b, c) {
-  a * b * c;
-  return;
+ return a * b * c;
 }
 
 /* 
diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
index c9221a200..0a6d7aea7 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,9 +1,11 @@
 // Add comments to explain what this function does. You're meant to use Google!
+// This function returns a random number between 0 and 10 but not 10
 function getNumber() {
   return Math.random() * 10;
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
+// This function joins the w1 and w2 or concatinates them (spelling questionable)
 function s(w1, w2) {
   return w1.concat(w2);
 }
@@ -11,6 +13,7 @@ function s(w1, w2) {
 function concatenate(firstWord, secondWord, thirdWord) {
   // Write the body of this function to concatenate three words together.
   // Look at the test case below to understand what this function is expected to return.
+  return `${firstWord} ${secondWord} ${thirdWord}`;
 }
 
 /* 
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index c9e41c691..bac02cf63 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -4,8 +4,12 @@
   A business requires a program that calculates how much sales tax to charge
   Sales tax is 20% of the price of the product
 */
+// productBefore is product price before tax is added 
 
-function calculateSalesTax() {}
+function calculateSalesTax(productBefore) {
+        let tax = 0.2;
+        return productBefore + productBefore * tax;
+}
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +21,12 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(productBefore) {
+  let newValue = `£${calculateSalesTax(productBefore).toFixed(2)}`;
+  return newValue;
+}
+
+
 
 /* 
 ===================================================